Hudson Camp Shirt

I bought this shirt for my husband and he absolutely loved it. It’s breathable and soft and fit loose in the way he likes it. However, after two uses, the fabric started to stain in a weird way around the pit areas. Guys sweat, it’s inevitable, but these pit stains were unreal. They almost look like bleach stains. Yes, we followed the care instructions on the tag. Not sure if it’s the color, the fabric, or a reaction from his deodorant, but it’s take a few washes to get it back to the original color. First picture is it soaking in a bleach-free oxi stain remover, second picture is after a full wash cycle.