youtube-dl-gui is only downloading half the videos on a channel

Please follow the guide below

You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
Put an x into all the boxes [ ] relevant to your issue (like that [x])
Use Preview tab to see how your issue will actually look like

All the invalid issues will be rejected!!

If your problem is a bug with the youtube-dl program or a request for new site support please report it here
Make sure you are using the latest youtube-dl-gui version: Options > About tab. If it's not please download & install the latest version for your OS and check if your issue still persists
Make sure you are using the latest youtube-dl version: Click the Update button on the main screen and check if your issue still persists
Make sure you searched the bugtracker for similar issues including closed ones
- [ ] I assure that my problem is NOT with youtube-dl
- [ ] I've verified and I assure that I'm running youtube-dl-gui 0.3.8
- [ ] I assure that i am using the latest version of youtube-dl
- [ ] Searched bugtracker

[x] Bug during the download process (encountered problems after hitting the Download button)
[ ] Bug other (encountered other problems with youtube-dl-gui)
[ ] Feature request (request for a new functionality)
[ ] Question
[ ] Other

Please remove the following section between the (---) if your problem does not belong to the bug during the download process category

Add -v flag to Options > Commands tab
Re-try to download the URL
Go to Options > Log tab and click the View Log button
Copy the whole content of the log file and insert it between the triple ``` part

[delete me and insert your log content here]

Please remove the following section between the (---) if your problem does not belong to the first two categories (bug report)