This could happen for a couple of reasons. First, make sure you're using creamy peanut butter rather than all-natural peanut butter, which is drier. Second, some people have trouble getting the old-fashioned oats to stick together. See if adding a little more honey or peanut butter helps. Another alternative is to blend about 1/4 cup of the old fashioned oats to create a "flour" which will help bind the ingredients. If you do this, add another tablespoon or so of honey.