Built wood vanity drawer deformed after painting!
This is a design problem

That appears to be 3 oak pieces joined to a crossways piece (does not actually matter much if it's plywood or solid in that orientation.)

It will be a humidity indicator. At present, the face has swelled and caused the present curve. When the face shrinks, it will go back to straight, if it dries &amp; shinks more than it was when glued (or screwed), the curve will reverse.

It's how wood behaves in varying humidity. Furniture with solid wood components is either designed to let it move, or suffers the consequences. If the oak is mounted with screws, remove them, then slot holes so the wood can move without forcing a curve into the part they mount to. If it's glued, you either live with it or rebuild (or at least break the glue bond and join with slotted screw holes.)