More details would be useful. However, here’s something that will occur if you stretch a clip longer than the clip actually is: Once the clip is longer on than timeline than it really is, it will repeat (as many times as necessary to fill the length on the timeline). Unless your ending clip is the same as the beginning clip and it’s looped, I really doubt this is the cause, though.
Whatever you see on the timeline is what you’ll get. So if you’re seeing the first frame at the end on the final output, it has to be there on the timeline as well. Zoom in on the timeline and see what’s really there.
Edward Troxel
