Thanks for telling me!
After about an hour of messing with the files, i finally found what was wrong: i had draw_all_glyphs set to "false" in my mod.json file. After setting it to "true", the blue squares disappeared: furthermore i also remembered to make the Armor Breaker and Corrosion abilities do more durability damage, just so they don't become totally worthless.
The new version of the mod should already be uploaded, so go ahead and see if it works on your end as well ;)