postname field works some of the time in permalinks

I did my best looking through permalink articles and I couldn’t find anything related to where the postname field works only some of the time.

In other words, I can use any combination of permalinks and my site will all function properly–all the summaries and links between pages will work. However, the actual permalinks that are generated don’t follow the pattern that I’ve set up.

For instance, right now my structure is set to:
/%year%/%monthnum%/%day%/%postname%/

And yet these were all automatically generated permalinks:
https://www.dancingwithwords.com/blog/2006/01/02/another-year/
https://www.dancingwithwords.com/blog/2005/09/01/112558368084858010/
https://www.dancingwithwords.com/blog/2004/02/14/107677100207804330/
https://www.dancingwithwords.com/blog/2001/08/01/getting-through-a-breakup/

Notice how two of those permalinks have correct postnames and two of them don’t. They all work. In general, my earliest entries all have the correct formatting, whereas none of the last 150 or so posts do, but my newest entry has the correct formatting as well.

I just moved to WordPress from Blogger this week (hence the lack of customization on the site). Any ideas?

Thanks!
Jared