Product page bug

I’m having an issue with pages which have 1 or 2 products only. The diagramming is completely bugged, with the images really small, the texts over the images, etc. The link below shows exactly what the issue is. What could be happening here?

https://corestudio.com.br/categoria-produto/quadros/?product-page=2

The page I need help with: [log in to see the link]