Collage view of lists with pale thumbnails

I noticed that the collage thumbnails of some lists (mostly older lists) are very pale. It's a washed out effect. Here is an example:

www.listal.com/list/female-portraits

This problem is new since the new listal version.

I've added to confirmed bugs here: www.listal.com/topic/image-collage-paleness

Thank you Tom.