When I try downloading full channel from youtube, JD not find all videos. These videos are not protected or anything, they are ordinary. What could be wrong?

I tried with these channels:
- **External links are only visible to Support Staff****External links are only visible to Support Staff** (find 851 links of 988)
- **External links are only visible to Support Staff****External links are only visible to Support Staff** (find 335 links of 336)