Indeed, it was measured with a little time difference, so it was totally ok for almost empty battery, not for the charged one.
Unfortunatelly, yes, but it's wrong. I've got a fully charged battery at the moment and it still shows 78mAh, so doing full discharge/charge cycle didn't help.
I guess there should be a method to start bq learning again... Gotta read docs when get home. Or bq isn't learning properly...