I've purchase maybe a dozen third party covers for my Kobo Glos and then Glo HDs, and had a misplaced magnet only once where the cover didn't work (and easily returned it for another of the same type that worked perfectly). It's just a fluke in the placement of the magnet during assembly and can happen with any brand or model.
I never could see spending half the price of the reader on one of the Kobo "official" covers and have always used third party covers.
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