OK I just compared it to mine, and that last image is a bit telling. It does look like there may be a bit of a bend in yours by the volume buttons. Again, this is also very likely not from use, but a manufacturing error, unless your desk itself is a bit warped there!. Especially considering the location because that's one of the spots that really doesn't get hot.
Here is mine for reference (please note: I have a glass screen protector on mine, so it is lifted a little bit by default).
(Also please ignore the dead Tyreal in the background...his wing broke and I need to fix him )
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Upon further inspection, it looks like in the last image your Switch isn't aligned with the edge of the desk. That is making it appear like it could be warped at quick glance.