Importing new Fbx File

Hi, i have fbx model, which is animated and was imported in many different versions until was finished. The issue is that the model is all distorted in game project, while in new project the model isnt distorted, so it has something to do with the specific project. I deleted all old fbx files, renamed the new one, tried to import many times and still the fbx is distorted in this project while it is not in any other project. Its realy not an option to recreate the project as the game is pretty much finished. So i guess the question is how to delete everything attached to the fbx even after it was deleted from project. I guess there are some left overs that are causing this issue.

Any help greatly appreciated. Thanks