The reason I have found: If you installed the cover, you should first put on the front cover, then the back cover.
I have just clipped while the magnet was not applied correctly to the IPad from Front Cover - but you'd never notice when using.
Now the magnet of the cover has signs of wear (my iPad has remained thankfully intact) and the plastic is broken.
The manufacturer should minimally enclose a note that care is taken to correct positioning of the front cover.
Otherwise, the color green has become very nice and I really liked.