It's probably easiest to explain by demonstration. Look at any of my posts with titles beginning with "Exploring RV Living..." At the start of each, I note that they are part of a series, with a link to the introductory post of the series. That link works just dandy whe reading an individual post. It also works fine from the home page of my blog. If, however, you are looking at the category view, the link does NOT work.
Compare the behavior of link "the introduction" between the individual post:
or home page http://homelessonwheels.com
where the link works fine, and reading it in category view:
where it does not. The URL seems to have the word "category" added in at the beginning where it doesn't belong. If I remove that word from the "bad" url, it will find the correct page (in spite of all the extra dates also apparently added to the path)
So... did I do something wrong? Or did I find a bug?