Much lower quality of LDR vs HDR in Render Target.

The only way i could recreate image 3 was to disable hdr with the render textures settings.

scenecapture before,
http://i.imgur.com/q2nuWLS.png

disable hdr option,
http://i.imgur.com/lucvPJi.jpg

scenecapture Image after,
http://i.imgur.com/TmCtZEd.png

It might be worth checking your texture settings.