Fine Fabric Shampoo is one of the most "user/customer friendly" products I've used. Its not changed much in 40 years, nor should it. I'm not as much of a
Prochem supporter as I used to be, but that product is great.
Now Fine Fabric COTTON Shampoo is another story. That's a rename of their Haitian Cotton Shampoo, which is indeed a metabisulfite loaded stinky concoction.
An unfortunate name similarity.
My guess is that you are "experiencing" the Fine Fabric
Cotton Shampoo