OK, check the image dimensions and quality (for thumbs and image) option settings because I think there’s something wrong since some images are resized larger than the original when opened in lightbox, hence they are blurred.
It would be better resize images with a graphic software before upload them, ready with the desidered res and full dimension for the lighbox display, not larger than about 800/900px long side. In this case you have to leave empty “what should images be resized to” field (image options).
But if you want resize them once loaded follow this guide.
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