You’re just between 1 and 2 standard deviations from the expected profit. It sucks, but it’s not extremely unlikely.
You should be closer to the flat yield, what is your bankroll, kelly and max stake? Post your Bet365 filter (if they are not the default) as well and we might be able to help.
Also, I just wrote a post that might help you and others that feel unlucky: How to analyze and improve your value betting results