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The oval appeareance of the sun at sunset is just an optical illusion and has nothing to do with a bad lens or something like that, ☺ .

WIKI says about this phenomenon: "Refraction also affects the apparent shape of the Sun when it is very close to the horizon. It makes things appear higher in the sky than they really are. Light from the bottom edge of the Sun's disk is refracted more than light from the top, since refraction increases as the angle of elevation decreases. This raises the apparent position of the bottom edge more than the top, reducing the apparent height of the solar disk. Its width is unaltered, so the disk appears wider than it is high."

This sunset image was taken at a south-west beach on the peninsula Walcheren, Zeeland, The Netherlands.