Also, I don't think this has anything to do with the city-razing bug mentioned above, because in case it is, the problem still exist then in all new updates of the mod.
To display the problem exacly: This BUG is always happening with the offshore platform, when someone goes and destroy an improved oil resource in the sea. As it happens, then the player to whom the offshore complex belongs, starts losing -6 oil&kerosene every turn.
You can also try this anytime by using ingame editor and going to a civilization's tile with an improved sea oil resource and just deleting it. . and see what happens in the next turn(s).
Now, is there any solution to fix this manually, by re-writing the code of the mode in a certain file inside the mod without making a whole update just only for that? How about that hulfgar?