I got a quest from the Empire to build a monument for +12 royal favor, with the penalty for not defending it (for 53 days!) being 4 manhunter bears. When I finished the monument I got the royal favor and the psylink, then I added a bed to make it a new bedroom for a pawn. When the 24 hour countdown finished, instead of releasing the bears it gave me a new monument marker. I placed the new marker and built the same monument, and again upon completion of the second monument I received another 12 royal favor and another psylink drop pod.
Trying a third time yielded the same result, quest completed again and rewarded. Pretty sure the problem is the monument marker being dropped again when you 'destroy' the monument.
Thanks, we should fix it.
Thanks for reporting! fixed for future release.