I think it's a missing title history. You might want to check c_meore, if all the map information is complete. I've dealt with it before and I think that was the solution. Also check to make sure that the RGB color code for the province matches what is in the definitions file.
Nevermind, turns out it was just good ol' incompetence. It's the same province as Småland, just renamed and with it's Holdings rearranged (since some are in the other 2 sections), but I accidentally changed it to "title = c_meore" in the province file from when I had the colours of it and Njudung reversed initially. That bit of text was the problem with the other province too, all the technical stuff was fine.
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