That might be what happens to this bale. I have never let them have a large bale, and I only have the two, but, I might let them have at it, and then scrap whatever goes bad before they finish it. It doesn't seem to have a lot of weeds, so I am going with it must be the long stemmy grass.Once I fix my pitchfork I will attack it with that again, or I will have lost my patience and will have cut it up already, or thrown it outside. And yes, I have had the you sneeze and they fall apart bales, those are also a major PITA! I haven't found any mold, and it isn't that stuck together moldy stuck, it is just like one solid woven block of hay. And if I could I would send it back, but they are gone, and I just got a new hay company which I will be picking up a few large bales from this weekend.