First, I'd like to quickly mention that if you purchased bonds and didn't receive them, please post here and I'll get them manually added for you.
For those of you in this situation, I could really use a bit more information to figure out why this issue is happening in the first place.
1. Were you redirected back to the store page from the Amazon website after purchasing?
2. Did the store page here, after being redirected, give you any purchase completed or error messages?
3. If you saved it, the exact URL here that you were redirected to after purchasing.