Video playback quality differs between servers

Hi all,

I had installed Plex on my parent’s Xbox 360 at a remote location so they can watch Plex, and I’m noticing that there are only a few options when it comes to video playback. I have 2 servers it can connect to, and one which is on an older version of PMS has the Maximum video quality setting available, but my main server which is up to the newest PMS can only go up to 1MBPs with 480p. So when they would watch a 1080op movie, it looks really bad. Why would one server have these higher options but not the other one?