Board Game Arena

I'm played 3 rank match last night and when I woke up, I saw myself in 2 match ( I dunno that 2 match are nor match or tournaments match since my koban start at 50, not 100 in rank match ). Thats weird cus I'm not register in any tournaments match. I played 3 rank match at 1-2am and I SWEAR I'M NOT FIND ANY MATCH EVEN NOR, RANK etc and this 2 weird match really scared me alot.
I'm panic. Help me ...

Don't panic.

The most likely explanation is that you accidentally searched for turn-based matches before you went to bed and found some.
This might have been through the new lobby (on the game's page) which would explain why the settings are different from your usual games.

The chances of someone else accessing your account to start turn-based games of Koi-Koi seems pretty low