Footprint problem

I made a transparent footprint.png of a right foot. Put it in the player directory. When I get in-game and start running .. I only get left foot prints.

In my player model I have the triggers set to 1 for the left foot and 2 for the right. The prints are placed correctly but just not getting left AND right. I tried putting triggers for 1/-1 and 2/-2 but it made no difference.

Thanks for any help.