Two urgent question about rendering the scene (3D tracking)

Two urgent question about rendering the scene (3D tracking):

The first question is removed - a solution is found. Now the main problem - the second question!

I made a 3D tracking
When I render the sequence, with the same number of frames (even more) as the original video, and the same fps, I get the video, which is shorter than the original. Where I made mistake and how to fix it?

I need to finish this shot as soon as possible, and I’ll be grateful for any advice!
Thanks in advance!