COD MW2 for PC Multiplayer , Something very strange CAN YOU please help?

sometimes after i finish the match that i play online and i make sure i have leaved the lobby ."but i'm still logging into steam just editing my new weapons" i'm New btw
and than after a while when i come back to play again as soon as click on "Find a Match" i found my self already inside a match that i didn't choose and i'm most of the time at the end of it, and probably get killed .
i only way i find it work, is when i logout and close all of the COD MW2 windows . but if there's other way to fix this.

IS that mean someone log into the with my account at the same time or what that mean ?
 
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