How did you create your wallet from Electrum mobile? If someone created it for you he might be the one who stole your Bitcoin. Or if the seed backup is created from other wallets like Bitpay?

If not, then there might be a keylogger in your device. Actually Xiaomi Phones is not secured as Samsung with Knox.

A similar case and address can be found below the same as hosseinimr93 posted above.
- [uncensored-r/Bitcoin] Bitpay wallet hacked - what went wrong?

That's why I suspected that this address is controlled by Bitpay? I'm not sure but if your seed backup is created from Bitpay and imported it to Electrum mobile... Maybe?