It is a flat spin that is sometimes hard to get out of. A rearward center of gravity location makes it easier to get into a flat spin and harder to recover.
Normal spins recover almost instantly when you quit pulling back on the elevator. To get out of a flat spin, you have to use rudder opposite of the spin direction, aileron with the spin direction, and down elevator. If you are in a inverted flat spin, you have to remember that rudder and elevator are reversed.