It's in fact a Creativ e Cloud trouble (not only on photoshop)
A Few days ago, my CC instaled the new versions available (PS, AI, ID, AE, PP) and i had some issues:
1- The new versions got installed, but it didn't delete the older versions.
2- All my in app preferences (workspace, plugins, etc) got lost in the new versions.
Had to uninstall the older versions manually through CC.
But the annoying part of the preferences I couldn't solve.
And yes: in preferences > advanced preferences i have all the apps checked for "Remove older versions" and " import previous settings and preferences".
What could have been the problem here?