hitTestObject dispatching randomly

Hello, I have a movieclip called blackCircle that is controlled by the user. I also have other movie clips created on a timer called redCircles. When the two movie clips collide score increases by 1. This works however at a certain area of the screen (and only at this area) there is a constant firing of the hitTestObject. I placed the if statement for this on the ENTER_FRAME of the redCircles as those are the numerous auto generated movieclips. At this certain area of the screen the if statement constantly evaluates to true despite the fact that there is no red circle present. What could be the causes for this? After the collision I am using this.removeChild to remove the red circle. The red circle is also traveling with a caurina Tweener.