It´s not about the website is wrong, it isn´t! It's about the so-called airdrop does not exist, feel free to ask in the official Telegram group:

Official Telegram: https://t.me/refereumtalk

Thus, OP probably tries to either capture your data and do some bullshit(Later scams) with it or just to build a Telegram channel for whatever reason. He tries to do it with using Refereum as a reference.