Adjusting Tower Glitch

Occasionally when changing the settings of a tower, such as upgrading or setting to a different attack mode, the tower appears to be changing settings. However, it actually becomes an un-adjustable tower, and throughout the rest of the game, it remains to appear "changing settings" [the 2 second animation of a tower changing, except unlimited time] but cannot actually do anything but attack as it was before the glitch occurred.

This can be especially annoying because it can never be upgraded, or even replaced by a more desirable tower

I'm sure many are aware of this glitch. Please have it removed!

These buggy towers are already known. The problem appears, if you change the tower setting and change it again, while its getting changed to the setting, you choose before.