But how, I need to insert a password for each time I send?
It´s not like I have my seed phrase on my sticky notes, it´s not easily accessible, and it looks like this was sent automatically.
It says "self-transfer" when I run a privacy analysis on blockstream.info
What sticky note is that an app or software on your PC? This app might have cloud sync which is pretty risky and possible someone already had access to your wallet.
Another thing is how did you install and know that Electrum you currently use is not fake?
Are you sure that you generated the seed phrase before without 3rd party or someone?
How did you protect your device from viruses and malware?