I can reproduce it, but it’s easier to demonstrate than describe (or at least, easier to describe with screen shots.) Before I put effort into making a “good” bug report, it would be helpful to know A) where to post bug reports (Github?) and if there’s a preferred format or template for that? (Maybe a Grist form? 
)
Thanks @SESummers, yes Github is the right place. When you go to make a new issue there on the grist-core repo, it will over you some templates, pick bug report. Feel free to include lots of screenshots
OK, this is bizarre. I went to make my screen shots and decided to turn off the Chrome DarkReader plugin to make the appearance match your standard. The problem went away. Somehow, DarkReader’s “Dynamic” mode can change the colors of text lines without any reason to, and prevent changes to colors from showing up until I hit refresh.