CSS field alignment inconsistency (in Commerce Backoffice "add new variation")

Some fields in the Details container float left (price and custom text field) and start stacking up horizontally. Other fiels don't float left and are nicely aligned to the left ("float:none" or nothing applied).

Additionally a custom text field in the variation is shrinked to approx. half width (515px computed).

Removing the float:left in contrib.css (273) solves this. But I don't know what else it affects.

.ief-product-attributes > .fieldset-wrapper > .form-wrapper, .ief-product-details > .fieldset-wrapper > .form-wrapper {
float: left;
margin-right: 25px;
}