At the first glance I could assume (but I could also be wrong) that somebody else also has access to the private keys of that wallet and as soon as any funds get there the other person moves them away to his own wallet.
--snip--
Without any other information from the OP, this ^^^ would be my gut feeling aswell.
OP: stop funding your wallet, stop creating new wallets on the same device... Don't keep repeating the same mistake and losing funds in the process.
I'd probably advice you to do a proper airgapped setup, properly create a paper wallet or buy a hardware wallet and move all your funds to said wallet ASAP. When creating an airgapped wallet, paper wallet or hardware wallet DO NOT save copy's of your seed, encryption password, (encrypted) private keys on ANY online device. Backups should be kept OFFLINE (on paper, or on any kind of medium that will never touch an online machine after storing the backup of the seed, password, key(s))
Once your funds are safe, you can start tracking down what went wrong:
- malware
- fake wallet version
- phising
- a simple mistake
- somebody having access to your seed, password, key(s)
- using an online wallet or an exchange wallet
If it has ANYTHING to do with malware or fake wallet versions, i'd even go as far as recomanding scratching your OS and starting over... (do make sure your funds are safe in a decent wallet first).
Before you start panicking: at this point, a simple mistake is still possible (for example, a lot of newbies get confused about change addresses, or use centralised custodial wallets and are confused when their funds moves)