Hi there!
I really don't know, with that info you are telling me, I can't think of a reason. Did you try it on a clean project?
Also, maybe you should consider using this plugin instead?
https://hakuenstudio.itch.io/eli-choice-manager-for-rpg-maker
It has the move choice functionality plus another one. I believe the free version will already help you out. This is more updated than this one.
Otherwise, I will need a sample project, but will only be able to take a look after 5th August.