Spellbook Gap Glitch

The spellbook gap glitch appears to be a graphical glitch that is currently known to be seen in the Runescape HD verson of the game. The glitch cannot be triggered; it is a graphical glitch in the normal spellbook that causes it to appear to have an empty spell slot in between the spells Fire strike and Weaken. It is unknown as to if this is an unintended side effect of the September 15th updates or if this may be a hint at a future add-on to the modern spellbook.