Video Track in new sequence 50% smaller.

Dear Folks,
I have edited a concert which has four simultaneous video tracks. I have cut and placed in the the V1 track, sections from each of the four camera clips, and it plays "normally" when play it back in the canvas; one shot transitions to another.

I started a new sequence (Sequence 2) to act as a "working copy" of the edited video, and copied all of the tracks of the original timeline into the new sequence. I clicked on the original edited sequence>hit "Select All" >"Copy"> clicked on the new sequence> then "Paste".

When I go to play back the V1 on the new sequence, one of the video tracks (V4) is reduced to about %50, and appears as a smaller rectangle that is centered against a black background.

When I copy and paste onto the original sequence (beginning about 10 seconds after the end of the original edited video), it retains the full size frame for each of the video tracks.

I could go to the Sequence 2 and manually resize each of the "V4" tracks in the timeline, but that seems a bit tedious with 300+ edited shots.

Is there something I can do differently? Is it some glitch in the system?
Any help is appreciated.

Thanks,

Gary