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I have a weird issue with images’ thumbnails.
See the original image (normal):
https://thejewelleryroom.com/wp-content/uploads/2018/10/MISS-RE-GOLD-DIAMOND-sapphire.jpg
And then the thumbnail (darker):
https://thejewelleryroom.com/wp-content/uploads/2018/10/MISS-RE-GOLD-DIAMOND-sapphire-1024×1024.jpg
Why does this happen?