Champion Level 3I'm not sure where you are adding test step comments in the test case - perhaps you have created a custom field - but I understand why you are having this issue. It is because the Test Case and Test Execution are entirely separate records.
The reason is, as I understand it, because a Test Case could be added to multiple Test Cycles, and each time that happens, a new Test Execution record for that Test Case is created.
Still, if you're updating the Test Case, the Test Player should recognise that the Test Case has changed, and present an "Update..." button, displayed at the top of the test steps - clicking on that will update the Test Case to the latest version.
