When a clip end is trimmed, the excess doesn't land on the cutting room floor. Instead, VP is told to end the clip there, but the video (your hand) remains.
If a transition is made at that point, there must be video to accommodate it...so the hand will reappear during the transition. This is normal.
(The same principle applies if a clip is trimmed at its start. Video that precedes the cut remains and would be used if a transition were programmed there.)
To make this work, right-click the sequence preview window and take a snapshot (still frame) just before the hand appears. The clip appears in the Images bin. Tack it onto the end of the moving video. Drag the handles to adjust its length.
Here's an example where the koala (followed by an unwanted, deleted scene) has been extended with the snapshot.

Then a transition was programmed from clip 2 to clip 3. The length of the transition will also affect the 'look.'