I would think that they would have to keep the product formulation the same to avoid a variety of issues. I would purchase another bottle and see what it looks like. Try for a different lot number. If it is the same yellow garbage I would shoot and email asking them if the formulation has changed. It is possible that a bad batch got through. I work in a variety of industrial settings and it isn't unheard of for a bad batch of chemical to get past QC on occasion.
Aaron