6-Piece Hydrocotton Bath Towel, Hand Towel & Washcloth Set

So I purchased this bath towel set along with two bath towels. The the color am having the issue with is Grey Vapor. My face cloths are now turn an odd looking light yellow. Now you ask how I washed my towels. Let’s just say am a Virgo. I only wash bath towels together, cold water, detergent with dye free ALL, no fabric softener of any kind, I use dryer balls. I also use color grabbers just in case. And definitely no bleach of any kind. This is the 3rd set of face cloth have done this ,my grey ones turn orange and pale blue ones turn dingy white. I thought it was something I did. Just beware. Bath towels are fine, just the face cloth, I guess some call them wash cloths.