Did you abort the game, or was it automatically aborted?
If you check your game archive, then is the game recorded there? If the game is there, then let us know and I'll see why you lost.
Whenever chess.com has a server restart, it gives a notification of it in live chess giving a countdown to the server restart. When the countdown hits 0:00, then the servers re-start and all ongoing games abort, so it is better to finish current games and then just wait for the server restart before starting a new game.
It told me game would be aborted but game wasn't and made me lose elo. Why?