Series numbering is a mess, how should it be resolved?

[⋆☆☽ Kriss ☾☆⋆]

I found a book that was in the wrong series and after removing it, discovered that that series is messy in terms of its numbering.

https://www.goodreads.com/series/8645...

The current editions number the seven works in it as being books 1-7 (seen on the covers, inner title pages, and list in listing description) but it appears over the years some books had previously been marked as novellas in between the main bodies of work and there was some discussion between the author and libraries about marking books based on what the author says it is or by what its page number/word count qualifies it as.

Some of the works were once marked as 0.5 (now as book 1) and 1.5 (now book 3) at different periods by both the author and librarians at different points, which appears to be the source of the wishy-washy numbering.

As a result, the individual book entries go from 0.5-3, 6-7, with two box sets acknowledging a book 4 and 5.

This seems a strange and unhelpful way of the books being organized, but I've never seen a situation like this before, so I'm quite baffled on the approach. The manual says that if a series is mostly made of novellas they should be whole integers, and 3/7 are short, with 2 more being under 200 pages and only 2 exceeding 200. It seems the author intended these to be integral reading of the story, rather than supplemental/spin-off materials.

Should the books themselves be edited to reflect a book 1-7 system, should books 6 and 7 be downgraded in number to match the 0.5, 1, 1.5, 3 system? Should it be left as is? Any insight into this would be greatly appreciated!