Just confused about change

In Tennessee. I needed to make the work requirements so got a second job that added $150/month to my income. I just recertified and received the new amount. We were getting $307/month, but it dropped to $132. I add $150 to my monthly income to meet the requirements and I lose $170 in food stamps. Nothing else changed so I'm not sure why this big drop. I really thought I was going to get ahead this year, but it keeps getting harder. {sigh}