Gallery Cards have all green fields but Approval button is not active


I’m trying to get approval for our domain, that has been approved already for Summary cards and Large Image Summary cards. However, after I submit a page to the validator, and all fields are marked green, I still can’t click the “Request Approval” button, which keeps being grey.
Is there anything I’m doing wrong?
This is one page I’m using for testing:

Also, images are all there, they also load if I navigate to their URL with my browser, but still they sometimes appear as white spaces in the card.

What do you think am I doing wrong?