Lightbox thumbnail resolution

Hi everyone!

I’m struggling with lightbox thumbnail resolution. I created a grid of images of different sizes that are supposed to be lightboxes as well, but some of them lack quality on a published website (see screenshots attached). Everything looks great in a preview though.
I thought webflow is supposed to create various resolutions for thumbnails and serve the best.
Is that normal? Am I not allowed to make thumbnails to big, or is it just a bug?

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