I have been able to solve it! What I did was:
I called up the preset cha cha style, pressed variation 4 where the problem was, and the problem was gone. Then I called up the style with the problem, and it now acted normally. I have had some problems with drum kits cating up, after I have changed styles. This also happened some times on my S975, so I guess it is a known problem. Please let me know is any of you have been having this issue.