I dealt with the problem alone. If someone else has a similar problem, I leave the solution for posterity :). The files have been duplicated. I removed all new folders (with newest data) and changed the old ones with "(2)" in the name to without "(2)". Remember to do such a thing only with those folders and files that are the same as those with "(2)"
-Preferences.backup - this one you have to delete
-Preferences.backup(2)- this one has to be changed to without (2)
I know it is probably no problem for someone who has a basic and elementary knowledge about such a things. But for me it was not obvious and I had no find any solution for this.
-Thank you for answer and solution Trufel.
-No problem Trufel