A lot of recent entries from your Pinboard timeline seem to be missing, including your most recent bookmark. Are you sure the list is being updated every 15 minutes?
BTW, your scroll.js has a commented-out section where you call 'pinboard.php', so I suppose you're using PHP to process your bookmarks. As the author of the PHP Pinboard API Client (github.com/kijin/pinboard-api), I'm curious whether you're using it, and if so, whether you have any suggestions for improving it.