Itunes Compilation Ordering Help

Hiya all, my itunes seems to have gone crazy....

On a number of compilations it seems to be sorting the tracks in alphabetical rather than track order and it is driving me mad. It is not all of my compilations though, just a random assortment.

I have double and triple checked all of the tags and they are fine, have tried playing the same albums in winamp and wmp and they play in track order.

This has only started happening recently and I cant for the life of me figure out why.

Any help you guys could offer me would be great! Thanks a lot.

I have attached a screenshot to better explain what I mean, the top compilation (tidy boys summer seaside special discs 1 and 2) is sorted by alphabetical artist name, yet the highlighted one underneath it is sorted my track number.

=(