Board Thread:New on My Singing Monsters Wiki/@comment-24441789-20140119192717/@comment-24188551-20140221144039

The shakeup you are seeing will be due to their latest update (1.2.5).

This was part of the changes they made on that update:

"• Improved Top Islands System: One island per player can be featured once a month, so more players have a chance to get their islands featured!"

This means more people get a chance to be featured, but of course that means that lower ranked islands float to the top as the higher ones get skimmed off for that month.