As I'm sure most of you have noticed, Trending is not really trending at the moment. We've noticed the issue reported by our community moderators and have addressed the issue on our end. The situation will need some time, most likely a couple days to resolve fully, for Trending to catch back up. We apologize for the inconvenience.
We have also be aware of how easily it is for user to "remake" packs to get them to show up as Trending again. We have some ideas on how to improve the algorithm backing our Trending code to make sure it doesn't favor new packs so heavily. Existing packs do have the ability to trend again and we don't want to overshadowed. Refreshing a pack should be as simple as updating an existing pack, not spamming the system with new packs, as this this is against the Modpack Terms.
Most of all, Happy New Year Crafters! We have a lot of exciting things planned for 2017!