Two days ago I started to have an issue with my Insert excerpt macros. When editing them they are now displaying vertically, one letter below the other. When published they are fine. It is making it very difficult to edit the pages as I use these a lot. I don't know if it is something that I've done or an Atlassian issue. I can't find anything else reported.
This is what I see when I edit....

This is what it looks like published.....