I hope you are having an awesome day and thanks for contacting us regarding your query.
We have investigated the URL you have provided us with and did notice a few of the images that were blurry as illustrated in the image attached or shown below.
Upon further investigation, we noticed that this specific image has a native resolution of 60px by 60px while the image container is 333px by 333px which will result in the image becoming pixelated upon scaling to fit the image container.
Another alternative in trying to resolve any blurry images that are not related to image dimensions using the Regenerate Thumbnails plugin.
After activating the plugin, go to Tools » Regen. Thumbnails from your WordPress Dashboard. Pressing the regenerate thumbnail button will start generating new image sizes defined by your theme or in Settings » Media page.
Please let me know if there are any more questions that I may answer for you 🙂