I've had a total of 3 bags with chunks (golf ball size up to baseball size) of moldy feed in them. Once was a couple months ago- Seemed like a fluke. But the last 2 were from the same batch it seemed. The first bag I noticed right away because the chunks were at the top of the bag. The second bag I didn't notice until I had emptied it the rest of the way into my barrel and the chunks fell out. Just an FYI to double check your feed when you open it. The most recent ones had the code 8APR20GNY1. At this point I think my local TSC thinks I am crazy because I keep coming back in with duct-taped bags of feed to return.