Why does it say BA is selected, despite there being no answers?

Question

http://pokemondb.net/pokebase/rmt/30673/rate-my-team-8

this question has no answers but the 0 is green instead of the usual red. no problem for me, but im just saying so you know about it:)

Answer 1

This happens when the best answer was hidden. The green remains but there is no actual visable answer there.