Earlier today I tried to export my model to Substance Painter, after doing that I realized that a part of my model is invisible in the program.
After searching the web for a bit I found out that negative scale can make mesh invisible, and after checking my scale I found it that it is indeed negative in that specific part of the model.
Now, the problem is that if I change the scale the whole mesh is getting messed up. Is it possible to change the scale without messing the object or fiddling with it too much afterwards?
Upon further inspection, I also noticed that from different angles some parts are visible from the back but not from the front, it looks like a normal issue but as you can see from the blend files all the faces are facing the right direction