To avoid that: After you take the cooked jam off of the heat for the last time, Sit it on a towel or a pot holder so that the pan stays as hot as possible. Let the hot jam sit in the hot p an for five minutes before you put it in the HOT jars. Stir the hot jam every 60 seconds or so with a CLEAN spoon. After the five minutes is up, put the jam in the hot jars and proceed with the same directions. This little trick will stop the fruit bits from floating to the top.