Your left sidebar isn't wide enough to accommodate your flyout menus. If you increase page width, increase width of sidebar and move Content div further right, it will work better.
It's works fine on every other page on the site.
I got some specific info from Gerry at Project VII about how to modify the style sheets to fix my problems. Great guy, who gave me some very detailed info which I'll share below - I'm not super code-savvy gut the fixes were simple enough.
It's just a matter of setting the menu div to position:relative and then setting a high z-index so it will render above the other page content. Add this style rule to your PMM style sheet: