Skipping Trials?

Hi!
I'm having some problems with DirectRT (v.2006) randomly skipping feedback /trials / something in a session. The task is a simple tracking task, where the subjects (monkeys) use a touch screen computer to tap where a picture shows up. What's happening goes something like this -- the picture comes up, the monkey smacks the screen, it skips the feedback and goes right into the next trial. I'm not sure exactly what's happening (i.e., if it's skipping the trial and re-doing it later, if it's just skipping the feedback and recording the monkey's response), or if it's doing something else entirely. I need to hear the feedback because I need to know whether or not the monkey got the trial correct (to reward them appropriately).
Any thoughts? I'm attaching one output file where this happened -- it was the 2nd trial that was 'skipped' or the feedback was 'skipped' or whatever happened...