I can't believe that you would believe any of these sites. Think about it for a moment. Fixed matches only make sense if no one knows that they are fixed. Why would anyone share that information? Whole idea on those is the fact that every insider stays safe and no one tells anyone, because if a word of that got out, every participant would get banned for life from betting and probably participating sports competitions as well.

Sudden drop or rise in the odds doesn't mean in any way that anything would be fixed. There's numerous reasons why those change other than it being a fixed match. I hate the term common sense, but that applies here as you can just use common sense to see trough it.