Hello,
I checked the product setup and found that the video is currently assigned to the main product image. In this case, WoodMart displays the video overlay on the featured image, which is why it appears as the first slide in the gallery.
If you would like the video to appear at the end of the gallery, please add the video to the last gallery image instead of the main product image. Once assigned to a gallery image, the video will be displayed in that position within the gallery sequence.
After making this change, the video will appear as the last gallery item rather than the first one.
See Screenshot for better understanding: https://postimg.cc/dLZ6tkJq
https://postimg.cc/zL7SPTFz
Best Regards