I had something like this happen myself. I had very little red but just by sitting wet in the washer, it stained a piece of fabric. Never got it all out, but lightened it some. I used the color catcher, but it happened after washing. It reminds me of a purple I bought at the Eleanor Burns tent sale, I must have washed that deep purple 15 times before it stopped bleeding. I do wonder why some fabrics bleed and others do not. Fabric Companies need to listen to us !!!
Hope all turns out well for you.