Those are called ligatures, and some fonts have those specially designed characters. It's not a problem at all, it's how the font was designed. Not all fonts have them, but some well designed fonts do.
how can you turn ligatures off?
There's no ligature setting in XD (advanced type controls would be nice). So the closet workaround I can think of would be to add a Character Spacing of 1 which will break them apart. Ideally that's done to just those 2 characters, because if you do it to all the chararacters you are adding a tiny amount of space across them all.
Thanks for the reply. Advanced typesetting would indeed be nice...
I've switched from TT Norms to TT Norms Pro. This typeface doesn't have the ligatures.
That worked! Thanks : )
You can cheat it by adding a space and setting the type size to 0