What is the expected outcome when two or more rates are set-up as Others/After-tax?

We have a client that has two standard rates with Rate Display Type = Others, and Tax Type Code = After-tax. With this set-up, how does the system determine which rate will be displayed in on the enrollment page in the "Others 2" column? We are experiencing inconsistency between PODs, where dev and test display one rate, while prod displays the other. We are testing this behavior in other dev pods but wanted to reach out to the broader community to understand more about the intended functionality. The system doesn't prevent us from setting two or