If you're looking at the ordering with the 'most recently updated' filter then it might look out of order because it includes people who have used the 'bump' button, instead of commenting, so it might look like it was last updated (commented on) a while back when actually someone has just bumped using the button.
If you've selected 'by start date' instead and it's still out of order then I can only assume there's some bug but it's a new one on me. There's an update to the software pending which may well fix it but getting the time to sort the update is very tricky at the moment but I'm trying!
Cheers