My walls looks weird when played on mobile! Weird that it is fine in Mobile Preview but when I actually play on phone it looks different. I think it is something to do with lighting but not sure.
ON PC
ON MOBILE
any solutions?
ON PC
ON MOBILE
Try disabling Lumen and Virtual Shadow Maps. Presumably, mobile platforms cannot handle these features and so cause significant lighting errors.
disabled both and still the same 
Please Refer to the following page:
Try enabling Forward Rendering as well; The workflow for Shader Model 5 is significantly different, so please test your game on mobile whenever possible.
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