Okay so i have beaten the main storyline and sided with the minutemen, at a point you will hear over radio freedom that the castle is being attacked, so just like any other time it shows a percentage of how much longer you have until the attacks stop, well my quest stopped at 30%, and no more attacks have been made i killed all of them, however the quest is stil there and shows 30% i cant talk to bonnie or preston and it clear it, i have tried sleeping, waiting everything i can think of and nothing has helped. I still hear over the radio that the walls have been breached but there are no enemies anywhere, has anyone else encountered this issue or have any ideas on how to resolve this issue?

Well the enemies spawn behind the adjacent buildings.

Have you scouted around in that area?

Other than that an earlier save might be your only option.

on a side note i have noticed that any stragglers left after 100% completion stop fighting.

Thanks man yeah they were stuck by some building so I went attacked and now they are coming again. Thank you.