The image that gets used when a video is the default product view is inappropriate. Here’s the image meta tag for such a product:
<meta property="og:image" content="https://rlv.zcache.com/modern_gold_black_script_2_photos_graduation_foil_invitation-r219e1fc5d6f44ca48fce770c1924a8f8_4idur_630.jpg?view_padding=%5B285%2C0%2C285%2C0%5D" />
Even though the image is set for 630px, it actually comes out at 4x that size (2520x2520px) in each dimension.
I don’t know if this also needs reporting but the image dimension meta tags seem wrong as well:
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="630" />
Here’s a tweet and a Facebook share:
Tweet Fb post in progress
When a video is set as the default, I think it would be better instead to use one of the non-video product images.