Jen, your azalea consists of a named top grafted onto a basic dwarf rhododendron rootstock. This is a common practice amongst nurserymen. Now, the rootstock is becoming dominant and producing the second flush of flowers that you now see. I would suggest that you prune off the stems at the base of the azalea producing the new flowers to keep the original one that you bought.

I thik that i'd re-pot it and give it a feed as well

Thanks for reply only just found the way to say thanks

hope the azaleas feeling better :o)