Unity register my Click as double click?

Hi all!
Im losing my mind right now.
Each time I click on a sprite it will open it in a Popup window (Windows Image Gallery Thiny).
Whats going on?!
Its as if every click I do in Unity register it as I am double clicking?! Its driving me insane.
This started a few days ago and I though it was my PC, but it seem to be the case Only In Unity.
Its almost impossible to work :*( Any idea whats going on?
Thanks!

For example… When I click on the small arrows in the Hierarchy it will close it straight away since Its thinking Im double clicking on it :confused: