Nothing you are doing wrong, Bill – they just need time! Lavender is extremely slow to grow from seed, partly just due to its nature and partly because woody plants generally take more time to grow from seed, especially if they start from a seed as small as that of lavender. Make sure they get plenty of sun and warmth and they will eventually take off. Though growing lavender from cuttings is much faster, there’s little that compares with the satisfaction of looking at a beautiful plant you grew yourself from seed.