Adding up the percentages in your grain bill, it looks like you are .01% short on the 10-gallon scaled batch. In other words, adding all the percentages in the 4 gallon batch equalled 100%. All the ingredients in the 10 gallon batch equalled 99.9%. I would say it's a rounding issue in the program. Either way, it's only .03% difference between the 2 batch sizes. I think you'll be fine either way.