Fluid cows Dissapeared

[llaya [LayaElisabeth]]

So, i had some fluid cows in different areas of my island, but a minute ago, they all dissapeared. When i mentioned it in chat other players found they had the same problems.
 

My island coord centre is x: -15800 y: 144 x: -13000
Is there a bug? or did someone delete them on purpose?
Also, should i mention which cows i had? or do i better file a rollback request, since the my island and all cows were still there half an hour ago?

EDIT: I wrote a rollback request since it's probably the easiest way to get my cows back

[Lancelot]

@LayaElisabeth got her cows back.

T/C