January 2024 update makes comment text very small upon hitting the space key after a word

When I place a comment in a document, after typing my first word in the comment, which shows as Arial 14, which is what I want, as soon as I hit the SPACE KEY to type the next word, the text of my first word becomes very small as does all the words I type after. This happens in all my clients' documents that I edit. What is the fix for this? Again, I have set my comment text to Arial 14 and it starts out Arial 14 until SPACE KEY is hit, then text becomes small. This is not fixable by any of the suggestions in threads I've read here. It must be a new fix. I've been using Adobe since 2000, so I'm familiar with its quirks, but this is a new one. Several members of my editing team across the US and UK are suddenly experiencing this (we are not on the same network and we use Macs and PCs).