So I would say the seed was somehow stolen, used to recover the wallet, and transfer the funds.
This is my guess too. Someone probably had access to your seed phrase and made that transaction manually.
If your wallet had been hacked, it wouldn't take 2 days to steal the funds.
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Well, it took 2 days, right? It's not clear to me how the wallet has been hacked. Someone generated wallet private keys and then brute force passwords until he managed to find the right one? Can you elaborate a little more in regards to the hacked wallet?