When we drop items in the bottom of the watch towers, they teleport to the top level and occasionally get damaged while teleporting.

We have noticed that if watch towers are placed on hills/uneven surfaces, it does not do this but on semi to level/flat surfaces is when it does this. However no matter what watch towers, the dropped items don't act correctly & occasionally we the map "eats" them. They are visible on our screen but not in the vicinity and we can't pick them back up.