Pleas help me! i got some weird things going on! i think a lot of mac players have this problem atm!

hi, i was in a game as kalista, not that this matters but, when i reach the right bottom corner lol goes out of full screen, if i hit my right border there is a 50% chance my mouse turns from the "glove" to my mac mouse icon, and i can only move, my keys wont activate abilitys again until i go out of full screen and re enter.... its annoying as hell and i got demoted cause of it... anyone of riot/ or some1 else a solution?
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