This past Thursday I put down 4 yards of dark brown hardwood mulch. Looked great. Then it rained steadily Friday and Saturday which seems to have washed most of the color out of the mulch, leaving it look like it's already a year old. What's the deal, is this normal?? I've seen other properties around that put similar-colored mulch down months ago it seems to be holding the color just fine. Did I just get a bad load?