I think blockchain.com mark you creating a lot account with the same IP/device that's why you got this problem, try to use a mobile device blockchain.com if you still got this problem went using a browser Laptop/PC.
Yes, I make block chain for my grandfather
If that's true and in this case you have created multiple accounts on the same IP and those accounts used to claim the stellar airdrop? *lol another joke this day. that guy above you said was true go to another PC with different IP and then try it again. When it's still getting the same problem and try it on your phone remember to use the different IP.
How much account that you have created on your IP?