Well that is certainly odd, you should have been given one of each. I have had quite a few orders of these lately, which Shapeways likely printed in a single batch, so it's likely that one of the engineers in charge of printing them simply got some mixed up, which also means someone else out there has two left paddles!
I would definitely contact Shapeways and ask for a re-print. You can find the 'Contact Us' button at the bottom of the page. Sorry about the mixup! You're definitely eligible for a free re-print though.