BST - I can't remove a Snap Area

Just installed BST I tried to work with it. When I tried to remove the two snap areas created for training, I could remove the second one but the the first one is still there.
Already tried to restart system, to remove ed re-install the application, remove application+shut down system+restart system+reinstall BST, but the snap area is still there.

If I create new snap areas I can remove them without any problem, but the first one is still there. I can't guess what happened at the beginning.
Do you hane any suggestion?
Thank you very much.

Note: Before bug reporting, please make sure you have tried the latest (alpha) version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS from the "User Diagnostic Reports" section.

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