Well, it fixes it for one person and is more consistent with the other map images (drop shadow, 24 bit png, transparent background), so it might as well replace the original in the pack.Yes, I use Napalm 1.22, but I've never had that issue myself.
KoolSmoky, thanks for the suggestion. I gave the app a run and there's quite a few problems in this pack. Mostly duplicate textures but there's a bunch in the wrong format, as well as a piece of a map that failed to load. For anyone interested, I've uploaded the results here - http://pastebin.ca/1422882
The file count and overall size of this pack could be greatly reduced if the duplicate textures were removed. There's also the case of improperly named/formatted images that the original author should deal with. It's not really a huge deal as Glide treats these textures as opaque, and that's fine for any texture which doesn't utilize transparency.