Could custom schemes be causing the issue?

eahm is using "BlackStuffBlue" that was posted here: https://forums.mirc.com/ubbthreads.php/topics/264467

Code
[colors]
n16=BlackStuffBlue,1,6,4,7,2,2,4,2,2,2,2,15,4,7,2,15,2,2,2,4,2,1,15,1,15,14,15,1,1,15,1



I'm using the stock mIRC classic scheme and I cannot replicate it or maybe I've not been in the channel long enough.
Code
[colors]
n0=mIRC Classic,0,6,4,5,2,3,3,3,3,3,3,1,5,7,6,1,3,2,3,5,1,0,1,0,1,14,6,0,0,1,97


It's happening on EFnet, no chghost/vhost/spoof/whatever.

eahm said the bug happened again while I was inside the channel. The channel ops nick was green then turned white on his screen. I did not see any change on mine.

I have had a /debug window opened for a few days and the persons nick!~ident@host has not changed.

We are both using znc.