If you open up the Developer Console (F12) in Chrome and switch to the sources tab, you will find that some portions of the sites you are visiting are being serviced from different domains on the internet.
Here is a sample output of what the dba.meta.stackexchange.com site looks like source-wise:
Here is a sample output of the sources for https://serverfault.com:
As you can see, the various stackexchange sites require components from different sources on the internet depending on who was responsible for the extensions used on that specific stackexchange site. This is possibly why you are observing different behaviour on different sites.
Ask the network security administrator at the U.S. state department to unblock the required sites on the firewall for you to post comments on the various stackexchange.com sites.