IPhone 3GS expanding in size?

I noticed that my iPhone 3GS physically GREW. It's cracking at the back and won't fit in the case anymore. I haven't heard of anyone having the same problem as I'm. I compared it to another iPhone 3GS and it's a lot thicker, it actually has a curve on the back. Why did it happen? Any information would help.

U bent it too much

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