Anybody else have this issue with the key signatures on MuseScore 4?

So everytime I add a new instrument, for example, I switched an acoustic bass for an electric bass and Trombone 4 for a Bass Trombone, and when I added those intruments, it shows the key signature is Eb major (3 flats), but I have the key signature set to C major (no sharps/flats). Is this a bug? I added a picture to show what I'm sort of talking about.