Apps not going back onto my phone

I had bought a few apps a few months ago and I updated my phone and they all got erased. But they are still on my itunes and will not transfer to my phone. And, when I go to the Apps store it wants me to buy them again. Why wont they transfer to my iphone? And, why do I have to buy them again?

What have you tried to get them on your iphone?
Are they compatible with the new software on your iphone?
Unlike music, you can redownload apps for free:
http://support.apple.com/kb/HT2519

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