Don't worry about it too much -- weight tends to fluctuate day by day, which is why it's better to weigh in only once a week or even less often if you can handle it (make sure to weight the same day, same time each time). You can't really measure progress on a day-to-day basis because there are a variety of factors that contribute to why your weight goes up and down. In fact, I have a friend who weighed herself throughout the day one day and noticed that her weight changed by 3 lbs from morning to night. That's obviously not 3lbs of fat!
And, losing 8 lbs in 3 days is really a lot. Like Schmoodle said, whatever fat you lost will stay off. And in the long run it is better to lose slow and steady. Just stick with it and you'll see results.
Your meal plan looks good, and I can't see 2 tablespoons of sunflower seeds having that impact. When you say 3 bottles of water do you mean nalgene-type bottles? If not, you should probably get in more water. Also, make sure you're getting enough calories each day, as your body will go into starvation mode and starting hoarding all the fat so that it can survive.
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