The values order is not working for "Affects Version/s" in a Test Executions list of a Test Plan

The sorting of the values in "Affects Version/s" is not working for Test Executions in a Test Plan

How to reproduce:

1. Create a Test Plan
2. Create several Test Executions that belong to the Test Plan
3. Each Test Execution should have a different version
4. In the Test Plan, on the Test Executions section try to sort by "Affects Version/s"
5. The first time might work, but after that, it does not work any longer