Macbook Pro Backplate Swollen On The Sides Macbook Pro 13 Function Keys Late 2016

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Could you please tell me why this is happening?

Either the bottom cover wasn’t taken off / put on properly or the battery cells are expanding meaning the battery would need to be replaced. MacBook Pro 13" Function Keys Late 2016 Battery Replacement MacBook Pro 13" Retina (Function Keys, Late 2016-2017) Battery iFixit Adhesive Remover I recommend opening first to make sure, note that once it is open and the cells are indeed expanded the bottom cover won’t be able to put back on until the battery is either removed or replaced.