Right click unreliable

When i hold right click down to pull back my arrow it seems to think i'm rapidly pressing and releasing the right click button... it will prematurely release arrow, and sometimes instantly shoot additional arrows in succession. 
I don't think its a bow problem... it feels like a right click button 'bounce' problem.

 

Edit: This also has similar problems when 'using' food to eat. 

 

Thank you,

Jon