Why does the print action button initiate the print menu when mouse hovers over it?

I have a fillable form with three action buttons: Print, Clear, and Submit. The problem is that if the mouse cursor hovers over the button it initiates the action.  I want the action to be performed if the button is clicked, not accidently hovered over. I have tried changing the triggers (e.g. Mouse Up, Mouse Down, etc.) - each have the same result.  Any suggestions?