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Since I have no exact information or pictures of your problem, it is difficult for me to identify the issuea. However, other addons you use may also affect the game.
Try "disabling" all your addons and just enable only the few needed addons that are listed in this workshop-page and try to load a default map like gm_flatgrass.
If you use additional content such as HL2 ep1&2 or CSS or other contents, try to deactivate them in case they overwrite certain textures or 3d models.
So, load Gmod without addons except for the few mentioned here for this dupe, inside of a Gmod standard map like gm_flattgrass and if its only a optical error that does not influence the fuctionallity of the vehicle, I can recomend this "Error Hide addon", to make them disapear...
(just in case):
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=236113181&searchtext=error+hide
Thanks for you feedback.
I added now the needed addons to this Workshop Page, so you can see what Addons you have to install first.