Android tablets don't translate well, especially on sites with ads that aren't set up for responsive sites. This version of SMF is fairly dated, and the only way it works with mobile devices is via the Tapatalk plugin. While that is good, I know SMF 2.1 is now using a default theme that is responsive. But with this site doing so many edits to get the forum to match, it would be tricky.
Did not do it before, don't use tapatalk, so that could be why it's doing it now. I understand they are still doing edits just passing along something I noticed. I agree with Angie that a delineation line between the topicsnpage would be nice, and I do like the gray background.