I can only tell you that it happened as a result of your carelessness. During or after wallet creation u expose ur passphrase to a wolf in sheep's clothing, u never took Pi serious

Pi looks like a complete scam.
A same address has transferred all my pi just after they were unlocked , like just in 5 seconds of unlocking. Now how is this even possible without the PI core team being in inclusion in it.
I have tracked the address and it has like thousands of transactions. It steals even pennies available in the wallet .
You can also track the scammer transactions from the address given below.

GBS6WKLVXLDGTIM2QRI4GBA6J4PKRS7VH5FFMAPFRBI2IX52GJEJO6TU