XnView Software

I have around 300 paintings and photos of paintings that have been scanned and I recently (last couple of months) found that some (25) of them have been reset to show with a high contrast. This is only in XnView MP. When opened in Photoshop or MS default photo viewer they are correct. I reinstalled XnView MP and it made no difference.
Image on the left is PS and the right is XnView.

Sorted. Somewhere along the line several/lots of images where changed from RGB to CYMK which really showed in XnView but not in any other app (XnView is a sensitive little creature ). Changed them into RGB in PS and all is good. Could it have been when saving for the Web I wonder.