I'd say it's normal. Even on real life situations like coin flip, you can get a streak like that. Considering the fact that you're betting on 2.00x, there's no surprise that you get a losing streak like that. You can have higher losing streaks than that tbh. It'd be much surprising if you're betting on a really low multiplier, meaning you have a really high chance of winning, and you get a losing streak like that. You're just unlucky IMO.