Companion Cert online has been in various states of broken for a while... for example the time pulldown menu appears to do nothing. Also, the website only presents a very limited number of flights compared to what is actually there. This is true when when booking a normal non-companion ticket.

Example:
BOS-LAS 9/2-9/10
First/Business
All of the flight options (20+) appear for the outgoing leg. However, only a handful of flights are shown for the return. I can only get them to appear if book by schedule through the normal booking engine... but this doesn't work for companion tickets so it only shows the same results as if I did a normal booking search. So even though there are dozens of flight options it only lets me pick from 3?
Also, picking a different routing for the outgoing leg will result in a couple more or less options for the return even though there is no price difference.