Video disappears when I click thumbnail in gallery

The free featured video works great, however it keeps a site from being locked SSL because it’s hiding an image and replacing with something else. Safari and Chrom aren’t happy about that. I also have the pro version, and it doesn’t give off the security flag, and it looks great, just like the free version. I can click all my gallery thumbs and see all my images, BUT when I try to click back on the first icon, the video, the video appears and the entire gallery slides up over it. This was a problem with the old myStile theme and now it’s a problem even with OceanWP which is what I’m using now. Is there a function or code I can paste in that will stop this from disappearing when I click the thumbnail in gallery? Thanks!