Reference frames are different from the original ones.

Hi, when I was using your model to generate intermediate frames, it seems that only the first reference frame is preserved in the output folder, the other reference frames are different. For example, I am interpolating frames 2, 3, 5, 6, 8, 9 with a sf = 3 and reference frames 1, 4, 7, 10. However, In the output file, frame 4, 7 are quite different from the input ones. Is this what it's supposed to be or did I understand something wrong. Thank you!