The colors of the pixels of in-game maps have changed in 1.8.1-pre. This change is not listed in the changelog. It is not clear if this change is intended or is a bug.
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is duplicated by 3
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Thanks for the quick reply. It isn't yet clear to me if there's just a new remapping, or if they have added more colors or how exactly the new coloring works, but I'll try to go figure it out now I guess.
yeah dude this bug is SSOOOO ANNNOOYYIINNGG!!! I didn't see ur post at first and accidentally made MC-75740
Looks to be intended, Grum had planned on fixing map colours for some blocks for a while:
http://www.reddit.com/r/Minecraft/comments/2bwy38/on_maps_sandstone_is_grey_and_gravel_is_sand/cjaq678