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I have not had the varnish come out with a brown tint but I did use it on my varnishing test figure that had previously been varnished with the Daler Rowney Soluble Acrylic Matte and it gave a patchy finish.I am also not sure how to clean the brush I use as the usual washing up liquid/soap and water do not give me a clean brush.
I have a couple of bottles at least two years old, still fine. Perhaps the recent heat wave, or some sort of contamination since you opened the bottle. Acrylics can go off, hence the awful smell from water or wet palettes.
You should try contacting them,can’t hurt
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