wrote

Last year I re-caulked the counter tops in the kitchen, now
a year later all the caulking has started to turn yellow.

I used Kitchen and bath white silicone caulking,
guaranteed not to mold, mildew are change
color. I don't know the brand.

What went wrong ?

You believed their claims and didnt keep the
receipt so you now can't hold their feet to the
fire and make them do a full refund and pay
for your wasted time.