It is normal, Thats why you will hear of punching down the cap. That is whta wine makers call it when we have to actually open our primaries and get all the stuff floating on top and push it back under to get it all wet a few times a day so that it doesnt dry up or spoil from being above evel of must. This typically referes to fruit or grapes but can be also pulp when you have a vigorous fermentation with a lot of foaming keeping all the pulp suspended. This punching down of the cap should be done a few times a day if possible but at least once a day. When its mainly pulp it will settle out pretty quick once fermentation settles down a little.