Blender vehicle model lines bug

[Kalcor, SA:MP]

Blender vehicle model lines bug

Hello, I've been learning Blender modeling and trying to edit and make some dff models but I discovered a bug that happens only with vehicle models on Blender. Does this have anything to do with my graphic card? Is there an option/preference that I should enable/disabled? Why do models look like this, because even after exporting them and adding them IG they have the same bug even IG. I really need help if anyone can help me this is really important to me, thank you!

Source: Blender vehicle model lines bug