so ive had 2 defend settlement quests in a row end this way... got the notice to go help defend, quickly fast travel to said settlement, kill whats there. i dont get a completed or failed noticed, just tells me to go talk to preston. i travel and talk to him the first time and it gives the bad news about settlement option, my character goes on to say about the first settlement that raiders managed to ravage the place, the problem being, it was super mutants that i killed there. the 2nd time, i was already at the settlement when the quest popped up and a bunch of rad scorpions spawned in, same thing there, no complete/fail, just talk to preston, i go talk to him this 2nd time, the speech option saying i was sad to say that super mutants ravaged the place and now both of those defend settlement quests are stuck as active and saying talk to preston in my pipboy. on a side note... i was in sanctuary when a rad storm started so i decided to just sit in a chair and wait for 4 hours, as soon as i come out of the wait, instantly 2 failed defend settlement quests that werent active when i started to wait, seems to me you should have your wait interrupted if you get a new quest like that