Good afternoon. A very unpleasant situation happened. I wanted to make a mass payment on bitcoin-addresses using the functionality of Electrum. Replenished the purse at 0.15 BTC
https://blockchain.info/en/tx/6a42ea66026653758c08d14e946a64e19794a408a937bf329445b0a7e57f2924
after which, almost immediately, a transaction appeared in the wallet to output a completely unknown address to me:
https://blockchain.info/tx/ecf39b1efd1a93923f2ab568a1c2b1cfd88c7a9f730c5e22db3305bd2299de6f for the amount of 0.1485 BTC. I did not commit it.

For the sake of the experiment, I re-added the purse to 0.05BTC - the situation repeated. Immediately there was a transaction to output to another completely unknown to me address.
Replenishment to 0.05 BTC: https://blockchain.info/tx/a14911f71e6ae99f5a38e5d789d30d31b6ae65e91584364853e4fa8b78efeb24
Formed output to 0.0495 BTC:
https://blockchain.info/tx/1030397a12a983b8818a4af309c05fd42dece6a82b3cd58e8fb21c3522bd2435

I did not make this conclusion either. How could this happen?
https://yadi.sk/i/EMOMFYUL3WGLDG - screenshot of the program window I enclose. At the time of the incident, the version of Electrum 3.0.5