I have an HP Pavilion x360 Convertible 14m-dw0xxx. The right half of the touch pad is noticeably lower than the left half. The left is completely flush with the rest of the laptop, but the right dips about 1 millimeter lower and makes a noticeable lip. The touch pad also has some give to it when pressing down on it. When clicking in the touch pad, it will dip 1 or 2 millimeters before I reach the point where I can actually make the touchpad click.
That said, it is hard to explain how touchpad screw(s) would loosen without something else going on.
If the battery is inflating / bloated, this would normally cause the touch pad to be pushed outward as opposed to dipping on one side while remaining flush and proper on the other side. Nonetheless, check the battery when you have the case open to make sure the battery is not in need of replacement.
If the computer is still in Warranty, reach out to HP Support and submit a case.
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