Macy's

I brought 3 sets (gray, navy blue & rust) of Ralph Lauren towels from Macy's and the first time I washed them the color faded. I washed them in regular soap detergent and they got blotches of brownish colors in different areas of the towels wash clothes. I have never seen this before in any towels even the cheap ones. I don't know why a towel would fade like this.