I'd try what alex.s suggests. There's not much I can do on the server side. vBulletin 3.8.7 is quite a few years old at this point, and was never intended for much mobile use. The mobile skin is very basic. Those with larger/more modern tablets tend to use the full site just as they would on a laptop/desktop, so there isn't an issue there. But for small-screen older tablets/phones, we're kinda stuck. I thought that we'd be onto a more modern platform by this point, but it's not a trivial exercise. Check out my
www.crf250l.org site for one built with xenforo, a somewhat more modern forum package. I have no intention of moving ninjette.org over to a new system any time soon, as the vbulletin upgrade paths appear to have become dead ends anyway.