Yes I noted, and there are also other wrong things I didn't fixed. I just fixed the worst for fun, a quick test that I made also to experiment some things with CSP.It's not the only problem.
If you want to paint the part in the green circle, the one below is automatically reflected. I haven't seen anything bad like this before.
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View attachment 1206211
Luckily I got the "Mod" as a Gift. š¤£
And by the way I have no intention to work further even if fixing the remaining could be quite easy. I think they should consider to make a total remap of the model. Anyway, the real problem of this model is that is really heavy as polycount, clearly done for a rendering (bought on cgtrader as they declare in the readme) and not for a game.