you can caulk if its small, or find a filler board to match. I am going to be using 2 freestanding vanities in my bath. will butt the countertop to the wall, and decide what to do based on visuals.
IF it is a free standing vanity, it isn't supposed to be sealed against a wall. The crack is normal. Post a picture of what you have so we can see what you see.
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