Spirit smells like rotten eggs

[Brewing bob]

Hi all, I done a mash recipe forme the home distiller page, cracked malt and malt extract SG 1086, FG 1028, same reading over 4 days so was sure ferment had finished, I've had a constant temp of 24 deg, I ran it through a turbo 500, was having a foaming problem so had to empty done out and start again, wash smelt fine but spirit smelt really bad so I gave up after 1.5 lt @ 92 ABV, can anyone tell me why it smells so bad and if I've done something wrong, thanks.