Is there an amount displayed next to the upcoming airdrops you have (there should be an amount)? Regardless if you weren't locked in by Dec first and the upcoming airdrops shown are INSTAR and INK then I wouldn't pay too much mind to it. They probably just coded to display upcoming airdrops regardless, and the values are unique per account will be the airdrop amounts shown.
If you happen to have specific airdrop amounts shown, you can try your luck to see what you can do. I don't see how you would go about getting it though, as soon as you try to escalate the issue it's going to be clear as day if the QSP wasn't in your wallet by the Dec 1st.
If i registered after 1 december i could receive the second and third airdrop of INSTAR and XNK? ( i know that they aren't airdroped all at once)
That's a gooood question, I'm not sure. Question though, did you have your QSP in non-exchange Ethereum based wallet prior to December 1st and then you registered for POC thereafter? Because if that's the case (don't quote me on this) I'm pretty sure you should be eligible. I believe the actual POC registration deadline for first initial airdrops was February 4th.