Can't Left Click in some games

I am having a hug bug on my mac laptop. In some games i cant left click idk why this is happening. That means i cant cast abilities get to shop with out pressing p and other things you need left click with. Why is this a big problem? well lets just say i left those game because am useless sry. People reported me for leaving/afk but its not my fault most i can do is feed. i cant even move my cam thing or look at the mini map. Now am in Low Priority queues because of that. is not fair. sure i left like 2 games but that was because i had to leave thats on me. Pls help me fix this bug or help me prevent it from happening again, and remove me from this low priority thingy. thxs