I've had similar problems, but not consistently. Deleting the offending field and recreating it solves the issue, as you point out. The only shortcut I've found is to do this with one field, then use the format painter to apply its settings to the others.
Thank you for your post.
I have not been able to reproduce the problem, and I know that doesn't help you. What font are you using? Do you have a way to replicate the problem? Do you have an older copy of your file (or a clone) so I can try it here? If so, please check your Inbox (top of this page) for instructions where to send the file.