Those -1 post entries are normal default entries to avoid mistakes. Since errors from when tracker campaign started, dev added this so at the start of crediting, it starts by making such a created entry before doing anything else for everyone. That way if credits are not processed for only some people it becomes very obvious to user (which might not be obvious to us otherwise, especially if it's only a few people at end of the queue, since without such a default entry, there would just be a few entries missing for that day and unless we counted manually entries for each day, we wouldn't notice a few missing one.) These entries make it easy to spot and easier to correct and reprocess failed credits

Dev added a lot of tracking/debug features since last issues and feature since the last problems. Tracker starting to become a really polished product. I got in touch with dev and issue will be looked into.