Bug with window snapping


I'm using window snapping since a long time.
Lately, I change my iMac and went to Mojave.
Since then, sometimes the windows snapping doesn't work. Nothing append.
When a try with the keyboard shortcuts, it work, but not with the mouse.

After some time, it's working again...

Could someone help me ?


Ok, I solved my problem.
I did disable by mistake the function for Safari only.