What mouse are you using? Is a tablet used? Is Windows' tablet support enabled? Is your graphics driver properly updated?
I use a mouse (Logitech Performance mouse MX).
Yes my nvidia graphics driver is up to date.
Any idea ?
It's most definitely an issu with the graphics card vs. your mouse, but which one is to blame is impossible to tell. You might try messing with your mosue and graphics settings, of course...
I will try another mouse first, maybe and let you know.
It's acting like a double click in fact.