Im unfamilliar to Blender's more advanced setting/glitches so i do not know how to title this question (i'll fix that later) but the normals (is this how its called or face direction?) suddenly started to look like the picture below (i dont know when it started doing this) 

the problem only happens with the "normal" normals, the inverted normals are fine, unfortunately this problem also shows in renders, please help

[![enter image description here](https://i.stack.imgur.com/Cre1M.png)](https://i.stack.imgur.com/Cre1M.png)