Models are Compiling with Incorrect collision/hitbox models! How do I fix it?

So I’m trying to recompile a map (ttt_minecraftcity_v4) and there’s these models of pigs that are in the pigpen.

When I’ve compiled it, the models spawn with incorrect hitboxes. I’ve tried different combinations of settings within prop_physics & prop_physics_multiplayer yada yada
The following video shows my issue:

What is causing this?

I just realized I’ve been compiling in FAST mode, would that be an issue?

Hello. Welcome to the Coding section of Garry’s Mod.

Have you tried the MODELING section?

Well crap - Sorry!

I thought I had seen a mapping section before, but I thought it was on a different forum somewhere else.

Turns out I had to just go way back to the home page. My bad! Delete this post if you need to!

Or move it?

PM a moderator to move it.