my 11 month old nephew is the same. i went with my sister to the health visitor when she asked about this. the health visitor said some were along the lines of...
it doesnt matter much as long as he eats whole things (rusks, peas, toast) and has the stage 1 jars aswell. she said its quite comon but not really a problem. they will all grow out of it eventualy.
i started giving my daughter lumpy things already (nearly 6months) because i want her used to them so she dosnt go through the same thing.