question on encounter variables. Options

[exkabuto]

can anyone help me how to setup encounter event?
i used a custom battle system named requiem abs 8.

well i want to make the player walk abit and then suddenly the player were transfered to anohter maps that filled with monster.
after win the battle, the player is teleport back to the maps. i only use 544x416 sized map since its a very mini rpg.
lets say real map is A and battle map is B. transfer happen after 10 step.
for my rpg, the map A is for dialogue and talk, and the Map B is for battle only.
i try use the step variable, its work when i walk on map A and teleport to map B after 10 step.
but when i win the battle on B map and wanna be teleport back to map A, an undesirable event happen.
i press F9 and see my variable is not decrease to zero.

i search google for hours but seems no clear guide to it.
if someone have time, please teach me how to event this.
thank you for reading.