I am using this version of Electrum 4.3.2 which I've downloaded from the official website.
You just scared me! If this is the case then I would say no online wallet is safe.
I would like to know if you hired any staff for campaign management, Or do you handle all the work by yourself single handly? Find out if someone else is using your computer.
Many times we use "Team Viewer" or "Any Desk" software for online meetings, and these are one of the reasons for getting hacked.