iGFX

I am doing a full screen capture. The playback directly from capture appears more like a time-lapse. I have the Debut capture frame rate set at 24 FPS but my editing software says it is 12 FPS, and the playback seems to bear this out with slow, choppy video. My editor is set at 24FPS will not go below 24, so I cannot set the project to match the clips (captured from streamed broadcast TV). Other capture software does not have this issue What are my options here, if any? Thanks