Price changes by itself sometimes

Gonna need some more information on your configuration here; how exactly are you using the price savings formatter and how are your product pricing rules configured? Screenshots would be helpful.

A price formatter does not actually change the price of the product. It's simply a display of the price components from resolved from the pricing rules. So this sounds like your pricing rules are misconfigured.

@recrit Yeah, I just didn't know if maybe it was only showing an incorrect discount but actually recording the correct price.

@hmartens Is that the 40% discount rule? Because multiplying by .7 is a 30% discount. Also, since there are no conditions on this rule, I don't know of any reason for it to provide an incorrect discount only some of the time.

Might be we just need to close this out or postpone it until we can actually see a reproducible behavior. Then we could determine the location of the problem (display vs. data) and actually figure out what's causing the behavior. Until then, there isn't much we can do at the module level.

The price component you choose shouldn't matter. In your case I'd leave it Discount and change the rounding method to round down. Revisions shouldn't have any bearing on this, either. It doesn't look like the one discount is getting applied multiple times, because I can't turn $75 into $15.80 with any successive discounts.

Can you confirm, perhaps with a masked screenshot of an order page, that the final line item total and order total are off and not just the displayed price on the product page? And is there any way for you to reproduce this behavior yourself? Ultimately I think you need to turn on Rules logging and see what happens when you reproduce the issue.

In any event, it doesn't sound like this is the result of Price Savings Formatter or Commerce itself; sure you don't have custom code in here?

We are having the same issue.
Our situation is that is does change the actual price of the product, not just how it displays.
We are having the same type of calculated changes as described here:

The sets are $78 . You get 45% discount. Now what sometimes happened and what happened here was that the price before discount changed on itself to the price after discount which is roughly $35. Then it adds the 45% discount on that and the sell price comes to roughly $15. So that's what happens

We've run single and multiple % discounts, both times this situation happens. What is strange is it does change randomly. It does happen on a single product variation, even if there are multiple. I can't confirm right now if its always the default.

I'm seeing this as well using commerce_conditions, rules_conditional, and a few PHP inputs to set up some price breaks for a manually created price table since commerce_price_table just wasn't a manageable solution for our use-case or client. The Rule is somehow changing the actual entered base price value on the price field of the product variation when the variation is saved. I can open an existing variation and set its price to $16.50, save it, and immediately re-open it to edit it, and the default value that loads in the price field will now show up as $1.06.

I've confirmed that it's the Rule doing this by simply disabling the Rule and repeating the above procedure to confirm the price does NOT change when the Rule is disabled.

My Rule is below and it appears to only attempt to alter commerce_line_item prices; I can see no evidence of it attempting to change commerce_product:commerce_price field, etc. Any chance that someone has an idea as to what is going on here? This price table and computing it is pretty vital.

Pricebreak Rule:

{ "rules_pricebreak_1" : {
    "LABEL" : "Pricebreak 1",
    "PLUGIN" : "reaction rule",
    "WEIGHT" : "-9",
    "OWNER" : "rules",
    "REQUIRES" : [
      "commerce_conditions",
      "rules_conditional",
      "commerce_line_item",
      "rules",
      "php",
      "commerce_product_reference"
    ],
    "ON" : { "commerce_product_calculate_sell_price" : [] },
    "IF" : [
      { "commerce_conditions_rules_condition_has_terms" : {
          "line_item" : [ "commerce-line-item" ],
          "field_name" : "field_material",
          "term_ids" : { "value" : { "189" : "189", "223" : "223", "225" : "225" } },
          "require_all" : "0"
        }
      }
    ],
    "DO" : [
      { "CONDITIONAL" : [
          {
            "IF" : { "php_eval" : { "code" : "return ([commerce-line-item:quantity] \u003E= 5 \u0026\u0026 [commerce-line-item:quantity] \u003C= 24);" } },
            "DO" : [
              { "commerce_line_item_unit_price_multiply" : {
                  "commerce_line_item" : [ "commerce_line_item" ],
                  "amount" : "0.65",
                  "component_name" : "base_price",
                  "round_mode" : "1"
                }
              }
            ]
          },
          {
            "ELSE IF" : { "php_eval" : { "code" : "return ([commerce-line-item:quantity] \u003E= 25 \u0026\u0026 [commerce-line-item:quantity] \u003C= 49);" } },
            "DO" : [
              { "commerce_line_item_unit_price_multiply" : {
                  "commerce_line_item" : [ "commerce_line_item" ],
                  "amount" : "0.55",
                  "component_name" : "base_price",
                  "round_mode" : "1"
                }
              }
            ]
          },
          {
            "ELSE IF" : { "php_eval" : { "code" : "return ([commerce-line-item:quantity] \u003E= 50 \u0026\u0026 [commerce-line-item:quantity] \u003C= 99);" } },
            "DO" : [
              { "commerce_line_item_unit_price_multiply" : {
                  "commerce_line_item" : [ "commerce_line_item" ],
                  "amount" : "0.45",
                  "component_name" : "base_price",
                  "round_mode" : "1"
                }
              }
            ]
          },
          {
            "ELSE IF" : { "php_eval" : { "code" : "return ([commerce-line-item:quantity] \u003E= 100);" } },
            "DO" : [
              { "commerce_line_item_unit_price_multiply" : {
                  "commerce_line_item" : [ "commerce_line_item" ],
                  "amount" : "0.40",
                  "component_name" : "base_price",
                  "round_mode" : "1"
                }
              }
            ]
          }
        ]
      }
    ]
  }
}