HI @Anonymous,
Could you please share a bit more about your issue?
Do you want to delete some old versions of an app within PowerApps?
I have made a test on my side, and don't have the issue that you mentioned. When I delete some old versions of an app, the corresponding version would be deleted.
In addition, in default, within the Version panel, the Live version of the app could not be deleted.
Please take a try to clear cache of your browser, and then try it again to check if the issue still exists.
Best regards,
Kris