Staff non aligned when changing instrument

I have a player with two instruments (piano and celesta). When I switch to celesta, the staff moves down automatically. Does anyone know what’s the problem here?

Thanks

Try removing the staff spacing adjustment you’ve made in Engrave mode; under some difficult to pin down circumstances the edits made to e.g. the piano instrument don’t always carry through to the celeste, but I’m pretty sure if you simply remove and then recreate the staff spacing adjustment, all will be well.

Yes, it was the staff spacing as you said. Thank you Daniel