Normally I can go into the Score Manager, drop down an instrument, and change the "Device" of a specific layer. In a recent score, whenever I try to do this on one staff in particular, it changes the Device of every single layer. This is a double staff, and I also can't change the Device of either of the staves independently. When I change one, the other changes as well.

I'm on Windows 10, version 26.3.1.520.