Not all videos displaying in Firefox

Hello galger. Thank you for your post. We have checked the website on three different browsers and the results were the same – 18 videos everywhere. We have attached the screenshots.
https://prntscr.com/cmiyak- Chrome
https://prntscr.com/cmiykk-IE 11
https://prntscr.com/cmiz3s-Firefox
Could you send us the screenshot of how does it look from your side?
Thank you!