I guess this was a bug in the script or you moved the coins before the airdrop. If they are stored on an exchange, you should be airdropped there.
If you can prove that you should have more, it shouldn't be a problem to get it. Include this information in your proposal with information about your steem wallet at the time of the airdrop. You can use steemd.com for that matter. Provide screenshots and links to the things you think dont fit.