The simplest format would be to have the Line Item in the subsummary part and the Vendor Name in the body. It looks like you may actually have that.
I would check to make sure the information you want in the body section is truly in the body section and not overlapping with other sections. Let a bit of white show above and below the Vendor Name field and see what happens.
Wow David, What a difference 2 pixals make.
Thats all it took,