When you’re in the first item, the url is http://rmc.libraryhost.com/exhibits/show/via-japanese-art-collection/item/94 .
But the previous and next buttons are the browse buttons for the entire Omeka installation and not the exhibit, so the links are http://rmc.libraryhost.com/items/show/93 and http://rmc.libraryhost.com/items/show/95 - the regular theme.
If you want, you can remove the previous and next buttons from initial item’s page