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I recently took off the back case to dust off the fans, all went well. Now, i’m opening it again to do a more thourough job, and it seems as if the back case is stuck to a piece of metal. When i pry it up after pulling back and releasing the clips i can see a metal thing stuck to the inside of the back case. Macbook still works, any idea what could be happening? The piece of metal is towards the right side!

Did you follow this guide? MacBook Pro 13" Function Keys 2017 Lower Case Replacement After lifting the front edge you need to slide it forward to release the tabs in the back. It sounds like you failed to do that.