Interesting but in my case I did not enter the codes manually. I imported an XML file so I can't tell you why the codes did not get parsed properly. I have been using epicGM for quite a while already so maybe back when I first imported the XML file the parsing of these codes did not work properly or maybe something else is going on.
Sadly atm I can't test if resetting and reimporting the compendium would help because the file picker is broken in Linux.
I first imported the files in Windows and have since then just copied the compendium around/used Dropbox to sync it.