Substance Paint Render

Hey everyone! I'm curious, first time usingg substance painter and exporting from Maya to Substance Paint; makes the model looks like this and I don't know why, since the original model is flat. just like a regular cube, so what's making the error? I'm pressuming this is the right subreddit.

https://preview.redd.it/n4dhm9jq20ee1.png?width=100&format=png&auto=webp&s=7fccdcfbb8a6fb4c61e96fd259b2aec00203fe74

https://preview.redd.it/mxngf2uk20ee1.png?width=250&format=png&auto=webp&s=3a33c771c8b9e25dd2ccb4c586e1638f0c81b645