That’s what i’m talking about, what can i do about this?
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This is a very common issue and has been solved many times, It is also very easy to find a solution by simply using google. Please do some research before resulting to asking on here as you would likely get your answer much faster than waiting for someone to reply.
Anyway here is the solution:
In edit mode select everything and press Ctrl+N.
Your issue is flipped normals, common occurrence especially when extruding faces as you have likely done.
It is also a good Idea to apply transforms before doing this. That is done by pressing Ctrl+A in object mode and selecting either scale, rotation, location or “All Transforms” which includes all previously mentioned.
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The solidify modifier simply adds “thickness” to a single sided face. The issue here is flipped normals.
Thank you for the answer, i didn’t really know how to word my search, as english is my second language.
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No problem, Im glad it solved your problem. Good luck with your project 
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This has already been marked as solved.
Also dont import from studio into blender if you have the original in blender - as its a game engine you will find that faces have been triangulated and edges have been split, this causes issues when trying to recalculate normals. You would have to remove duplicates and then remove the extra edges that have been made during the triangulation process if you wish to have quads again. These are very unnecessary steps that are completely avoided by simply making sure you recalculate normals before exporting from blender.
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