Some M1 iMacs appear to have a manufacturing defect that causes the display to be mounted on the stand in a way that’s not perfectly aligned, leading to a crooked display.
YouTuber iPhonedo over the weekend published a review of the M1 iMac, and he found that his machine appeared to be tilted on one side, a mounting disparity that was visibly noticeable and proved with a ruler.
Another person on the Apple Support Communities also complained of a non-level display with a 1mm disparity between the right and the left sides of the display, and there was a third complaint on Reddit, with the person in that situation discovering the issue after watching iPhonedo’s video.
Read more at MacRumors.com