Thanks for the reply. It seems like only rich text boxes were affected. I've tried changing the character height and coming up with a simple formula (i.e 3" text goes to 3.25") but it's still ever so slightly different and it means updating text boxes and font sizes on like 35 plans....
I don't want to mess with the font file quite yet as I'm worried it'll make things even worse. Also, the font version is still showing version 8 00 from May 2, 2022. So I don't think it's the actual font file... Something about installing X15 changed the displayed size of rich text in X12 even though it's still showing my same sizes....
Really confused and a little miffed.