Where are the differences

I get this so a lot of people when I run Tree Share.
No apparent differences.
Anyone have this issue?

It means Ancestry changed something in the background on that tree or collections when you see no changes that triggered it. It could also mean in Settings, WebHints you have “Clear on accept” unchecked. They will remain on the changed list then until you clear them by clicking on the button in the top right with the X on it.

Thanks, good to know