Sample Ratio Mismatch (SRM) occurs when one test variant receives notably more traffic than expected.

As such, the ratio of traffic is not equally distributed, despite whether or not traffic has been split evenly.

When SRM happens, results are not fully trustworthy and the test should be re-run.

For more detailed information on SRM, see this article: https://guessthetest.com/sample-ratio-mismatch-srm-explained/