Imported blender model has invisible planes in Unity

After looking around I found no answers to this and this is the reason why I am asking here. I made a model in blender, then imported it into Unity only to find some planes in the mesh are facing the wrong way, so I go back into blender, find the faces on the model, flip them the other way and then reimport them into Unity.

The exact same spot is still facing the wrong way, despite being flipped and saved in blender.

I googled my problem and it only has questions for the blender planes being the wrong way and then being fixed in blender but I have a feeling this may be a problem in Unity itself.

I'm fairly new to Unity and I learn by googling tutorials but here I've had no luck so that's why I have to ask for help here, if there's some settings somewhere in Unity that could affect the meshes of imported models. If there are special settings(because I've browsed through Unity and had no luck finding any that would affect this to my knowledge) please take a screenshot as this is incredibly helpful.

Also due to copyright, I can't show or upload any part of the model or game file.