I`m able to replicate this in Chrome and Firefox. They also had another post whereby Bing was showing ten sitelinks for a single listing instead of six, whereas most were still only showing six. I can replicate this as well for Bed, Bath and Beyond. And a third one. I`ve just put them in a numbered list:
1. Boxes such as menu, flight status, location, etc.
2. Ten site links for "special" sites
3. Customer service telephone numbers
No one knows what Bing is using to associate the 10 site links and the boxes (for menus, flight check ins, etc).
Bing Adds Boxes to Search Results to Highlight Popular Pages on Site - The SEM Post
