Left click doesn't work when playing Sion on Mac [GAMEPLAY]

I discovered a bug where left mouse button clicks don't have any effect (neither in the settings nor the shop or the ability level up buttons). However, double left clicks have the effect single clicks would usually have. This bug occurs every time I play Sion. I play the game on a Mac.

I'd be really glad if you fixed this bug quick, since it makes playing Sion a pain in the ass.