Doepfer

I have reassembled my Doepfer modular and now I have a strange behavier with one of my two A-190-2's.
I only have about 4 octaves of CV.
When I choose C1 as reference it goes from A1 to C6, when I choose C0 it goes from C1 to C5. I do not have this behavier with my other A-190-2, even not when I swap them.
The strange behavier also lasts when I use the outher Gate / CV pins instead of the internal connection.
Anybody have a clue?
TIA,
Danny