Font changes on parts of stage directions

I’ve had this problem for a while. I write my script in Courier Prime, which I believe is the Scrivener default font. But when I save a file and later re-open it, stage directions or portions of stage directions are now in the Bodoni MT Poster Compressedfont, which is hard even to read.

Sometimes it’s a whole stage direction, other times just part of one, with some words still in Courier Prime, while other stage directions remain just fine in Courier Prime. The bug seems pretty random.

Is there anything I can do about this? Thanks!