Hello, @johan28,
This issue is because of the video height, As you can see you have the video as well for the same product and the video have more height than the images of the product as shown in these screenshots: https://ibb.co/r2yPFVd & https://ibb.co/j4ZRSXh
So you have to change the height of your video and then it will work properly.
Regards 8Themes Team.