Reply to left jog wheel

hey yall. so i just bought a vci-100 slightly used and im trying to get started. my one problem is that my left jog wheel "tips" if i push on the top left part of it. this does not seem normal since the right does not do it i was wondering if anyone had tips for a newbie on how to fix or where to get it fixed, or if its normal and im just too new to know better. i realize i got it slightly used but everything else works great and i just wanna try to get this issue fixed.

thanks a million