I used this same answer in another post about this issue -I was having the same problem with quests like that and emailed Kiwi about. They responded with the answer of getting rid of the buildings.

I wasn't going to do that as I had spend many axes and such just to get to that point of the quest. I finally did the "clear data" in application manager and it worked because it recognized that 2nd click I needed for each one.

Would have been nice if that Kiwi employee would have known that would fix the problem instead of me having to research until I found the solution myself.