I recently found a solution to the forums being too wide and clipping off the side of the of the screen, but now I see a mostly transparent image in front of everything on the site, though I can click on things (touch really, since I'm on a phone) behind the image.
Width Solution (I'll post this on my thread for the width issue)
Android seems to have a "zoom everything" setting on the settings page where you can change the system font and font size. My phone was set to about 20% zoom by default (I neber found the setting before so it couldn't have been me). Zooming out as far as possible and shrinking font a bit as well as changing the font and now I see the full width of the forum pages except when typing. Note; this solution is not perfect, as when I'm typing a new post the right side cuts off, and typing a new thread, both sides cut off. In neither case is enough lost to inhibit anything, but it still is page sides being cut off. In the case of making a new thread the title bars didn't go all the way to the right, almost like titlebars had shifted to left off screen more than the amount of right edge that is off screen.
The image is mostly transparent and stuck to the bottom right of the screen, not the page.
The image shows a cliff on the right and a couple characters (the rogue and wizard) climbing a ladder with a sword being held in a hand in the foreground, all in Paizo's visual cartoony style.