I haven't made it much lately, but the Austrian malt bread I made yesterday came out a lot darker on the inside than I remember it being back in the days when I made it in a bread machine. Maybe it just didn't rise as much and that makes it look darker.
The malted milk powder had solidified, but I broke it up some with a rubber mallet, so I might have just wound up with more of it than normal, or maybe it gets darker when it hardens, which happens if the jar isn't well sealed, as it is very hygroscopic.