I’m running a bit late showcasing my monthly recap. This is what April 2017 looked like: 

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I noticed a month ago that some of the images compiled into a gallery change colours compared to the posts where they are displayed as regular photos. I already complained to the WordPress team a month ago, but they did not help. Has anyone else had the same issue?

P.S. Slideshow seems to be working fine as far as colours are concerned.

P.S.1. After discussing the issue with WordPress a solution was not found to gallery thumbnail mosaic display, but I found that displaying the images as thumbnail grid does the trick – preserves the colours and other features.