If you have a 2.0 theme, go to Edit Code > main-product.liquid and delete the following code:[ Approx. Line 121 ] <div {{ block.shopify_attributes }}>{%- assign product_form_installment_id = 'product-form-installment-' | append: section.id -%}{%- for...

I had the same issue. I found that if you go to the product-template.liquid, you can change the product image size in second line of code.  Since all of my product images are 1600x1600, I change the line of code to:{% assign product_image_size = '160...