As the seasons changed from Hurricane to Monsoon, the winds abruptly stopped as the screen filter changed from light blue to light green. The problem is that the items on the island that were being pushed by the wind were still being pushed. All the manure just slipped into the jungle silently.
Steps to Reproduce
Wait until the Hurricane season ends while the wind is blowing and watch the manure run away.
This issue has not been confirmed by a developer yet.