Hi @Philippe27928271x649 as @kevin stohlmeyer said, it could be your prefs are corrupt and a clean out will solve this.
Let's make sure we're in a default state and there are no stale settings somewhere:
Restore your preferences using this manual method:
Does it work correctly?
If that doesn't solve it, you can quit Photoshop and put the Settings folder back.
It may help if we could see your Photoshop System Info. Launch Photoshop, and select Help >System Info...and copy/paste the text in a reply.