Only one video is coming up. how do I make it work with more than one video?

I am using the plugin and using the following code:

[youtubegallery]
https://www.youtube.com/watch?v=suCmEkdpDEc
https://www.youtube.com/watch?v=FVCgoM26y4Y
https://www.youtube.com/watch?v=s4UliuPRj4A
https://www.youtube.com/watch?v=Qg7kmC7ThFc
[/youtubegallery]

Only one video is coming up. I cannot figure out how to get the rest of the videos to come up. I set it up for four columns and I have tried a bunch of different videos.

Can someone help?

Here is the link to the page I am trying to figure out.

https://openmindfitness.com/?page_id=24

Thanks,

https://www.ads-software.com/plugins/youtube-simplegallery/