Hoagies - Why is one so different?

I just made a batch of the same hoagie rolls that I bake regularly. One of the four came out very different from the other three and I didn't intentionally do anything different. Please see the picture and link to recipe in my blog post at http://www.thefreshloaf.com/node/32130/hoagies-why-one-so-different

Please post any thoughts on this on the blog and thanks to Floyd and all that participate in this great site.

wayne