The TOC for this page is 4.1 and the linked TOC appropriately appears at the top. It also appears just following 4.1.2 [Identifiers]
I think the second occurrence is unintended and should be removed.
I have a slight issue with the formatting of the linked TOC in that it starts beneath the title of the given page. Shouldn't it precede the title? Maybe that isn't possible, but it looks a little weird (and this applies to all pages, not just this one). I'm probably not the first to have brought up this issue, so if it has already been decided that this is the format that works, so be it.