Ethernauts Level 8 (Vault)

Hi everyone!

I understand the intended solution for level 8 (I will not spoil it here), but I was wondering why it doesn't seem to be possible to grab the secret by looking at the input data for the Contract Creation txn on Etherscan. The give code shows that the secret was originally passed into the constructor, but the last 32 bytes of hex that I see on Etherscan doesn't match the secret, and seems to vary across different users.