I tried searching for a similar topic but couldn’t find one…hopefully I’m not blind.
I keep seeing this happen during the personal story instances. Mainly the low level ones from lvl’s 1-30, where I try talking to a NPC and it bring’s up a box before closing it and the re-opening a dialogue box that looks like it’s taking the stance that the mission has finished. It’s not really a big bug but I felt I needed to report it as it can break immersion for those playing I guess.