IPhone 4 separates texts sent and received into two different conversations?

IPhone 4 32gb
iOS 5.1.1
BB 4.10.01
Not jailbroken

For some reason, my iPhone 4 seems to be separating texts received and sent into two separate conversations ( as if they were from different people, which their not ). I also noticed that is only happening with texts from people who don't have iPhones.
Has anybody else had the same issue? If so is there a fix for it?

It's not a problem, that happens to every iPhone.

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