This should be a font issue. Choose a font you are sure it’s accessible for LibO on your system for the comments (‘Format All Comments’).
Maybe there was something pasted into the comment in another font and that font wasn’t correctly replaced by the one set for comments. I could imagine such an error most likely if the document was shifted around using different file standards (not odt but doc, docx e.g.).
BTW The shown comment originally read: This is kinda a dumb reason, I hate to say. L “just in case” is good enough.
Hope, I didn’t unveil your secrets.
Editing with regard to recent comments:
As I was told there was a very recent update (“last week”) I assumed we were both using V 4.3.5. The context menus are as I told under this version. I meanwhile also tried V 4.1.5.3 (Portable, German UI) and there the equivalent menu items were missing.
However, I do not actually expect the ‘Format All Comments’ being the solution. Some features may be under rapid development for a while. Please name your versions for this thread and in future similar cases. Of course, the most likely reason for your problems is that the defaced parts of the comment were inserted under MS Word. You cannot expect any feature to be equally supported by independently “invented” applications.
Please try this attached example.: ask44132Comments001.odt