It's probably a bug introduced with the recent update as Simon implemented text formatting, effects, & transitions, which is currently buggy. Hopefully we'll get a bugfix update sometime in the near future.
I'll create a bug report on our discord server & link your thread to it.
By the way, it would help if you could provide some extra details. maybe about the font you used & what platform(s) you've exported for & if you've tried exporting to various platforms, does it also have the same issue on each of them?