I finally managed to contact the owner of the buildings and he destroyed them.
But the problem of incorrect updating of the timer is actual:
When a player is not in the network, his buildings are updated from neighboring strangers.
Glad to hear that the issue has resolved. In the future, we are unfortunately unable to moderate any other in-game issues with other player structures that you are having. We are currently investigating other systems to implement into the game to solve issues like these in the future. Please keep a look out for more information.
Edit: I am going to close this topic as it is solved. Please feel free to create a new thread as more issues arise.