3 staves top two

Why does the signpost say +1 staff, - 1 staff when I move back from temporary three staves to two for piano? Ijus wanted to drop back to two, that’s all.

This may have something to do with the strange audio repeat II have described in another post.

Take a look in Galley view. Have you removed a different staff than the one you added? Here I added a staff above the RH and then removed the LH staff.

Yes, I think so.

But fixing it really screws up the whole rest of the piece in odd ways too hard to descriibe here.

Go into Write Mode, Galley View.
You will see all staves.
If you think, things are messed up (having ended up in an unnecessary system), select the music and move it to the right system.
I would suggest, you do this by simple select/cut/ paste.
Once everything is where it should belong, get clear of the unnecessary staves.