White boxes next to drop-down menus

I have multiple drop-down menus using the Findcools theme. Under Chrome I see a little white box next to each menu. Under Firefox, I see the same box with what appears to be the letters FI and OT. Under IE, the menus display without these annoying little boxes.

Website: https://www.ircinc.org

I would like to find a way to make the boxes go away so that the appearance is uniform across the three main browsers.