can't access my WP site from my office network

I've setup a Wordpress installation that works fine, but for some reason I cannot access it from my office. I've flushed my DNS and reset the office router/modem, and showed Linode support my hosts file, which they say is setup correctly. When I run curl on the domain, I may get a different output each time.

$ curl -s joejalbert.com | fgrep '

then literally 1 second later:

$ curl -s joejalbert.com | fgrep '

fwiw, yesterday I was able to access the WP site via Firefox, but not Chrome or Safari. Today I cannot access it at all from my location. This is clearly an issue that is specific to me, as I can access the site from any other location or through a proxy. I have absolutely no idea what could be causing it as I've cleared my cache in each browser, flushed DNS on my machine, and reset my router. Any insight at all would be greatly appreciated. Thanks!