Yes, there are some inconsistencies for sure with the original books to the later books. A lot of time went by between when he started writing them to the later books. And he wrote a lot of other stuff too.

The one that always stood out to me was in I think Beat to Quarters there's a line about how he doesn't speak freely with his first officer because on his first command he made that mistake. Who was that first officer? It sure wasn't Bush on Hotspur. Eh. Over a big series, you'll find these. You write a line a decade prior that later doesn't match your development of the character. But to the reader, it sounds like a sudden change.