When you place down cobblestone walls next to cobblestone, cobble stairs, or cobble slabs there is a quite noticeable color difference.
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This is a issue of Custom Colors of MCPatcher.
This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.
It's not a bug. I think it's your TP.