My avax is gone from my Wallet and I see a recent transfer

Dear friends, please help. It’s urgent and I am desperate!

I staked my Avax in Dec, and I chose a short period, which ended in early Jan. Now when I logged into my Avax wallet, I don’t see my balance anywhere. I looked at the transferred account and found this strange transfer done on Jan 05 at 10pm:

From:

avax1nrv4u786kyffym560ufc5ha2a8v6r83q8hsfkl

to

avax1zwfgnq3huqsh8397hpjj2f04q4hv8p29m4xkjj

My 31 Avax was gone this way. I really have no clue how someone could have my seeds (I can guarantee it is 100% safe). How in the world would someone have this seed and carried out the transfer on Jan 05, 2022?

Please help me, DEV. That’s a large amount of money for me. THank you.