I used the hair product colorsilk revlon golden blonde 71, it did not dye my hair it lightened it. why did that happen

Being a mere male (with grey hair) I am not an expert but I read the product description;

"This Revlon 3D Color Technology, with a combination of specially blended dyes, conditioners and polymers, delivers natural looking, multi-tonal color from root to tip, not only boosting your hair color but also adding definition and dimensionality. The result: completely transformed, natural looking, multifaceted color and shine."

I take that to mean the product is a colour booster rather than a hair dye - in other words your hair would need to be approximately that colour to begin with.
My limited knowledge might be out of date but I always believed if a person wanted hair of a lighter colour it would have to be bleached and not dyed.