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That's normal. Use a still image to test whether your application works fine.

Camera frames differ by image noise. The frames may be visually identical, but looking closely at the pixel will show that they are not. The local feature detections (although they are designed for stability and robustness) do change due to this noise. If you need stable detections you might rise the controlling thresholds but you will end up with a handful of features only which is in most applications insufficient.

If you are working on video you might track features over time and remove those that vary in order to determine the stable features.