Mostly a single click will act like two clicks.
For example: I want to go back one page on a web-browser but go back two or I have word processor open and want to open the drop down menu to change fonts and it opens and closes in one stroke as though I had double-clicked.
It makes things extra tedious and laborious as one can imagine having to try again each time V E R Y carefully
I have already checked the Mouse speed specification under Systems and brought that right down but no change.
Suggestions?