suddenly it said i am logged in on another device

so i was playing a couple blitz games and thats when i saw a popup saying i was logged in another device making the connection go away. my phone was besides me but i never really touched nor logged in with it so this kinda confused me. i simply refreshed the tab and the game continued normal on my laptop but idk the logical explanation to why that moment happened?

Weird I recommend clicking this button though  

“log out on all devices”

thought u meant change password for a second lol 

but yes log out all devices and change password

i think it was just random so i mean eh

cause i remember playing on the app so maybe my phone just turned it on accidentally cause i remember hearing the chess.com sound being on and i didn't close the app on my phone