I can't reproduce this with the information given, so there's nothing we can do about it. If it only happened one time then it could have a number of accidental causes, but it's probably nothing to worry about unless it's happening consistently.

What browsers are you using when you experience this issue? Do incorrect items always send when you get the "You don't have that item" message, or are they separate issues?

Does it normally happen when you have more than one gift? Does it send anything, or just errors out?

Just pinging again in case the previous one got deleted with all the holiday events! :P