I bought some pedals during the double points weekend and at first the double points didn't show up. After the pedals arrived I checked again and it was corrected. If you just joined TP it may take a while to get it in the system but just give it a few days and I bet it will be corrected.
By the way there is now a 15% off coupon (6002377) to go along with free shipping and of course your normal 10% back now.