Do you find yourself resubmitting chapters that you've already queued up? I'm pretty sure I've tweaked and twiddled, not just catching mistakes but smoothing out rough edges, every chapter after the first for "Protective Coloration" after I already had what I thought was the final version submitted. I did the same thing with "Building a Better Past", going so far as to almost rewrite one of the later chapters.
It doesn't feel like that's a great way to do things, shouldn't this all have been done before posting? It's not even like I'm reacting to reader feedback, things just slot into place now that weren't doing so before I started posting.