Board Thread:Support Requests - Getting Technical/@comment-7117024-20151123205719

On my wiki, I have an infobox for episodes. However, the sub headers on it don't go out as long as the main header, as seen here. I can't tell where this problem is coming from, and all the other infobox templates I have which use the same style work fine without having the same problem. Can anyone help me figure out how to fix this?

Also, with that template, is it possible to place horizontal lines between fields? If so, how do I do it, and if not, that's okay.

Thank you so much! 