Daddy123, 
The doctor couldn't really explain why they were different--he said they should NOT be different...and I didn't really know how to respond to that.
Andy,
To my knowledge, all of the tests were done at the same lab.  I know that at least two of them were.   
 I did read online last night that if you are iron defiicient along with having thalassemia, it can make your A2 levels appear normal (though I am not sure if that is true!).  When I had the first series of blood tests, my iron was normal, but "low normal" so  I almost wonder if that has something to do with it...
It's just crazy to me that all of the results were different, when they're supposed to always be the same. 
-dahlia