Your browser now identifies itself as "CCBot/2.0 (https://commoncrawl.org/faq/)" but before it identified itself as "istellabot/t.1.13". Since this cannot be, I have to conclude that you are running a browser or some kind of firewall that fiddles around with the identity of the browser. This site needs to know the make (and perhaps version) of your browser in order to display the pages properly formatted for that browser. Your setup prevents this.
You should therefore disable whatever it is you are running that does this in order to continue to browse this site.
If you believe that the detection of this is in error, you are welcome to contact the web master
. Please include as much information about your InterNet setup as possible, and remember to include your email address.