[readerboy7]

For some reason, FFF (v 2.13.0 on calibre 3.1.1) isn't looking at the threadmarks for Spacebattles stories, only the links in the OP. This presents a problem when I try to update my library.
Example URL:

https://forums.spacebattles.com/threads/472801/ Existing epub contains 29 chapters, web site only has 2. Use Overwrite to force update.

(30 threadmarks in story, 1 link in the OP)
How do I fix this, to get it to look at threadmarks)