Following a tip a day ago to try using the Factbook to obtain outlines of different biblical books, I tried this for Isaiah. I get the following results (on account of having the excellent Believers Church Bible Commentary in my library).
I suspect it's happening because Logos automatically picks up each mention of the section heading "Outline", even when an outline is given for every chapter, as with the BCBC commentary.
I don't really think it's an issue to have the software work like that (so it's not entirely a bug) but given that it happens, it strikes me that it would be much more useful to actually list, for example, "Isariah 49 outline" or "Isaiah 49 outline", rather than just list tonnes of identical outlines named "Outline". Screen shot below:
