I'm not sure exactly what you're saying the problem is, but when I try searching Google for the cache of that page, it tells me it can't find it. That isn't unusual - on a large site with thousands of pages, you can't necessarily expect each and every one to be cached.
To be honest, I don't think it's a big deal. If your pages are being indexed properly and appearing where you want them to in the results pages, that's what matters. Only a tiny number of people use Google's cache (and the main reason for doing that is if your website itself goes offline or has trouble).