Problem after exporting model from Blender.

So, it’s my first time porting a model, so please be gentle with me here.

Alright, I’ve fixed a QC, according to this tutorial and from a friend.

But, I get this when opening it in HLMV. The model gets duplicated and just looks like a human helicopter. The textures is not the problem, the problem is just that there are two models instead of one.

As this is my first time, I’ve no clue as to what to look for, so any help is highly appreciated

Also, this is how it looks like in Blender:

I really need help with this, so if anyone knows what to do, please help me.