Assertion checks say they are valid, but still fail

I have a series of assertion checks in my test case. For all of them, they display in the results that they asserted properly (assertEqual() for $a and $b says they are the same, or assert() with an expression passed in tells me the result was TRUE), but mark the assertion as a failed test. For instance I will have one test with 6 assertion checks in it. For all of them, the output says that they have the proper values, but they are all marked as failures and I am told my test has 6 failures. At the same time, all automatic checks such as entries for a drupalPost and status 200 codes on page requests are passing without any issue.

Any ideas would be well appreciated. Thanks.