Why is it that everytime my traffic increases, my rankings get lower?

-It first started with Alexa. My ranking showed to be around the 300,000 range with about 400-500 visitors a day. Then when my number of visitors got higher, my ranking dropped to the 2,000,000 range.

So I looked at and and saw that they were both in the 200,000 range. I felt a lot better and thought it was more accurate.

Then my alexa ranking started to get higher and I was expected all 3 sites to finally meet eachother halfway. I also started getting a lot of link backs to my sites for the past two months because bloggers were talking about a contest that I was running.

So here's what happened.

As of two days ago on, my ranking was still around 200,000. Yesterday, my website finally broke 1,000 visitors for one whole day, after staying around 700-900 visitors a day for weeks.

So I then check today and see that my ranking dropped down to 994,776 and my ranking for is now blank (not showing at all). And compete is now saying that I got 1,336 uniques for the past month, when my Awstats said that I got over 10,000 uniques the past month. I know my awstats is accurate because my stats show a steady trail of growth patterns.

WTH is going on!?!?!