@Cloudbet I doubt this is a bug but I will be a good user and pretend it is,
Whenever you place a live bet and the odds have moved below (lower odds) in the seconds after you click place bet you have to confirm your bet manually, however if the odds move above (higher odds) the bet get accepted automatically at the lower odds.
I tried that about enough times to be sure it's not a coincidence and it seriously encourages me to leave your sportsbook, Robbery in broad daylight.