Blender / Mixamo /clip studio modeler problem : my model is see through?

Hello, I have no idea if this is the right place to post this :confused:
Please take note that I have absolutely no knowledge in blender, my first idea was just creating a simple character model to export it in Mixamo and then register it in Clip Studio Modeler, for a personal art project.
I have this problem for a while now : I created my model in blender, then exported it .fbx for Mixamo, but when the model is completed in Mixamo it is partially see-through ??
I continued the process and uploaded it in Clip studio modeler : same thing, the model is weird.

Can someone help me ? I think it is a problem with the model in blender, but I never used blender before and im completely lost…

Are the normals facing the right way?

Oh my ! Yeah that was the solution thank you ! I recalculated the normal and the problem was gone