Custom headicon problems

[Tally]

You can only set 15 headicons. (might be one more, but the limit is low)

Edit:

What materials are you using? It could be that they have the wrong settings. I thought you were using your own custom images.

Isn't the limit lower? Isn't it only 12 max? I only used 12 in my mod, but I can't remember whether it was because the statusicon max limit was 12, or whether headicons is 12.