About modified traffic signs

So I’ve installed modified traffic signs to FiveM, currently client side. There is one problem, and it shows up when you literally just blow to the sign (I mean walking towards/over it). It falls down, and sometimes duplicates, even in three parts.

I wonder what is the reason of that? Maybe because there are some model files (.yft)?

And I also don’t know if this is the right place for this discussion because this is not really a FiveM problem, but didn’t figure better place to ask. And yes, this happens on single player too when installed to mods folder of GTA.

Thanks!