One thing I noticed in line 62 is that you have some php tags nested within php tags. That could be a source of problems.
Another thing I see, in the same place is the use of echo within an echo. Off the top of my head I don’t know if that will work. I am leaning towards no.
I made a fork of your codepen and rewrote it in the style of how I write PHP.
http://codepen.io/jessecfisher/pen/okfms
For html heavy sections, I prefer to escape from php using the closing tag ?>
This method becomes a little sloppy looking in places, such as closing the for loop, you can end up with something like this
But overall I find this style much more readable.
I hope this helps
