Sherbet uses same oddsprovider as some other sportsbooks that many players have had bad experiences lately (bc.game/rollbit/owl.games/etc.) according to what I've been reading on here, twitter and trustpilot. This oddsprovider is very actively flagging accounts that are placing good bets (value bets) and/or accusing players of arb abusing or syndicate betting.

I would really suggest to avoid sportsbooks using this oddsprovider for the time being, decent risk of your winnings being confiscated.