Expression maps become crazy after some tweak

Hello,
trying to work well with expression map and Halion Sonic SO but after some tweak and few minutes of regular playback, instruments begin to respond to other key switches instead to respect maps in the editor. I’ve changed the cello map to a pizzicato but continue to play a trills. If I stop the sequencer and select the single note then the playing is right.
Any advice for this strange behaviour?