Doesn't fit deep mattresses

These sheets are nice and soft and everything fit but the fitted sheet, which ripped when I tried to get the last corner on. Not going to return it because I did try too hard to get the corner on, but I'm disappointed that it wouldn't fit correctly. Now the last corner of the sheet just lays over the corner with the mattress protector underneath it exposed. I do have a great mattress set and figure it's too deep for the set. Luckily, my bed's huge and the affected corner is just where my dog sleeps.

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