Results Displaying Strangely in Search Engines

That looks like it is coming from an output format that makes the data in Omeka more shareable. It doesn't seem like one of the ones that ships with Omeka, though, so I'm not quite sure where it's coming from. Maybe a plugin?

I'm not sure we can do much about what Google sees and indexes, especially since it doesn't seem to be part of Omeka core.