TF2 logic_timer

[Peppridge Farms]

So I recently completed almost everything on a map I am making for my group, a halloween themed map. However, I set a logic_timer entity to fire even 120 seconds which will spawn tf_zombie (skeletons) entities as well as one skeleton king. I can get it to spawn them once but the timer wont reset or refire, is there something I am missing?

 

[Pinewabble]

maybe you have accidentally ticked the "fire once only" box? ;P