CommunityDKP, just like MonolithDKP, for some strange reason incorporates its own tc_colors/core.CColors duplicating the data that's already available as part of WoW's own RAID_CLASS_COLORS table. If the player has RAID_CLASS_COLORS changed (most often to change the color of shamans from pink to blue) - it's not replicated in CommunityDKP.

The hacky solution I've been using previously:

 for i = 1, #tc_classes do
 	local cname = tc_classes[i]
 	local lname = string.upper(cname)
-	core.CColors[lname] = tc_colors[cname]
+	core.CColors[lname] =
+	{
+		r = RAID_CLASS_COLORS[lname].r,
+		g = RAID_CLASS_COLORS[lname].g,
+		b = RAID_CLASS_COLORS[lname].b,
+		hex = RAID_CLASS_COLORS[lname].colorStr:sub(-6),
+	}
	table.insert(core.classes, lname)
end

But the best solution would be to get rid of tc_colors/core.CColors entirely and just use RAID_CLASS_COLORS.

Thank you so much for filing a bug or feature request! You're helping to make CommunityDKP even better!

This has been implemented in master and will be sent out on next release.