Your nandroid backups are probable on the internal sdcard instead of the external sdcard. Move them over to external and you should regain your space.
Phones & Tablets: Galaxy S4, Galaxy Note 8", Evo 4g LTE, Evo 3D, Acer Iconia A500, Samsung Galaxy Tab 2 10.1, Ipad 2, Nabi 2,
Rom: Rooted Stock for now, Hotspot Mod, Xposed, Wanum
Kernel: Stock for now