Imported Models Aren't Appearing

So, I have this really cool map (in my opinion) that I'm working on, and I have a little problem.

In the World Editor, I place down some imported files (Examples: Prowler, Tempest Tank, Siege Tank, Steam Fortress, etc), and in the editor they have the correct model. But when I test my map, the models are back to what they were originaly, Siege Engines.

Um...? I tried going to the model file, and for some reason it was on custom, and then I put it back to import with the correct file.

This has just recently happened to me. Earlier the new models had no problems.

Help would be appreciated

Bump, really need help please

I have made a new siege engine, changed its model to the prowler, tested, and it didn't work. I tried seeing if it would work in local, and it didn't. Am I screwed!?