Today I changed the algorithm that determines what chapters to push out when on the "Set rate by end date" feeds.
Unfortunately, the change means that current feed subscribes will jump forward by about one chapter in their progression. I apologize about any problems that may result from this change. ScriptureCast.net is still in beta, so changes like these aren't totally unexpected.
In feeds created with "Set rate by end date," new chapters are pushed out at variable rates determined by the length of the chapter. This new algorithm waits a short time after short chapters and a long time after long chapters before pushing out the next chapter.