Hi @Lukasz,
I don’t know if it’s related but I had a similar experience whit the LP3 when I didn’t know the ending tap had to happen before the end of the bar. If it’s a tiny bit too late, you can have a whole blank measure added to your recording. I’m not sure it’s still the case but you can read a few posts from this one :
LP3 Basic is the big one. The little one is called LP3 One.