If funds transferred to another unknown wallet without any action from your side mean your seed phrase or private keys have been compromised somehow. May be you have downloaded electrum from fake source or may be you have created paper wallet from fake or phishing sources. Sorry to say but it won't reverse anymore.
The day before yesterday, my wallet with physical cash was stolen, and today - the rest of my hope was cleared.
Are you sure your private key were not written on your physical wallet ? If so, then likely same guy steal your fund. Anyway don't be hopeless, somehow you will be out of this problems. Try to manage fund from offline.
Actually, there are always a case like this. Phishing sites can victim people by just copying the address. Maybe, he gathered the site without asking some veteran in using electrum wallet. I was also a victim of phishing site before but I prevented it when I verified to my mentor and he said its a wrong mew.
As of now, I am always double check the sites first before I am opening so that I am aware of the site.