My generated harmonies get a higher and higher pitch during the song...!

I have Cubase 13 Pro. I have a strange and new problem, at least for me.
When I generate Harmony voices, from a lead voicetrack and with the Chord track it makes the harmonies goes higher and higher in pitch. It starts very good and right, but after a while it all of a sudden jumps with all harmonies about 8-10 notes upp, very random. And after a while it goes even further up. At the end of the song all the harmonies have shifted up over 2-3 octaves…
I have been doing a lot of building harmonies before and never with this problem.
Anyone got a clue what I have might done wrong, somewhere?
I have not found my mistake yet, keep searching. But I would really need some help…
/Anders Larm, Sweden