Hello M7, so far I just checked out the castle near Dragonbridge (I love it). The NPC Felix Antiqurian and a castle guard started to follow me around the castle. Sometimes they would run backwards and then run forwards to catch up with me. A small bug, but kind of annoying; they kept getting in my way.

ok thanks for reporting.
M7

ok I checked the NPCs -- there is no problem with Faction and they don't have "Follow the Player" in their AI Packages. Can you specify which part of the Castle? I noticed when playing it they would walk backwards or follow if I had contact with the NPC for "brawling" (if you ask the NPC for Intimidation/Brawling) this will eventually stop on its own. So it's probably that. Thanks for the report.
M7.

Yes, it indeed happened after the brawl. They actually followed me in every part of the castle. When I went back to the castle they stopped following me around the area.

that happened to me too. Since "brawl" is a Faction (Favor Faction) which I never discovered before, it would appear to be the situation. They do eventually stop following.
M7. if there is anything else please do report it. Thanks. :)