To me that sounds very suspicious
But its true that through age and heat that sometimes when removing the CPU Heatsink the CPU itself may be lifted out with it (as the CPU thermal paste has hardened to the heatsink so much)
Is it possible that you bent the pins whilst removing it?
If not, then it must have been them
You can try to straighten the pins yourself, I have used a flat ruler and tweezers or tiny pliers to bend them straight again (you might want to upload a pic of it before you try this)
You also need to re-thermal paste the CPU (obviously clean it first)
Here is a guide on that procedure: Arctic Silver Incorporated - Route to Product Instructions for Arctic Silver 5