Muse score not transposing B-flat instrument

This doesn't happen often, but when I download Musescores to edit them or add instruments to it, normally it automatically transposes it for me. (E.g. if the score is in Concert B-flat, the Clarinet will be in the Key of C).

Normally it works fine, but there have been a few instances where I downloaded a Musescores and if I add an instrument that has a different key (e.g. B-flat instrument, F instrument) it won't transpose it to its Key for that instrument.

I know one way I could fix it is to just copy the entire score and paste it in a new one to correct the transposition, but that gets rid of all the page breaks, spacing, and text that I have added to it.

I was trying to find out if there is a quicker fix that I can do on the actual score.

I have tried to do the 'Replace instrument" and ensure the instrument was in the correct key (Eg. Clarinet's drop down menu is set to Bflat) but to doesn't seem to change anything .

Again, I know I can just copy and paste it in a new Muse score, but it not all the text will transfer over, which would be a Hassel to do all over again.