Hi there!
>The issue still occur.
The issue seems not to appear on my end. On which OS/browser is the issue present?
>By the way, what’s the best way to compress images on the WOOCOMMERCE platform? Without using plugins.
Just to check, did you mean resizing or compressing?
On WooCommerce, you can only set the image dimensions that WooCommerce should use if your theme allows it, but not control the compression of image file sizes. This documentation explains further about resizing images: https://docs.woocommerce.com/document/fixing-blurry-product-images/#section-4
For compressing images without using plugins, I would suggest using the following sites to compress the images before uploading them to your site:
*There are several other online/offline tools for compressing images, so feel free to search around.
Here’s an article you might want to check out that explains more about compressing images for WordPress: https://woocommerce.com/posts/wordpress-image-compression/
I hope this helps.
Thanks.