Even if you remove the hat, it won't look strange. I've found that re-importing these 3.6 version models back into version 4.4 still causes many strange issues. Let me explain how to use this model: obviously you need at least some experience with Blender. After importing the model, you need to delete the dummy head I marked in the upper‑right corner, then home the real head by moving it along the X‑axis. After that, you can use the model normally. (Why are there two heads? Because the real head has both a subdivision modifier and shape keys, but Sketchfab only shows that head as a low‑poly preview. To ensure a complete preview, I had to duplicate a head and leave it in place.)