Can someone tell me if this is normal?

I have two passengers on one PNR. NRT-DFW-MIA. I requested to use two SWUs to upgrade only NRT-DFW for both passengers because the DFW-MIA is already booked full in first. When checking the res online, I get a "standby" menu. It shows my original flights in economy with the same seats as originally booked. But when I click the "standby flight" it lists NRT-DFW in economy (with originally booked seats) and right below it has the same NRT-DFW flight but with business listed and the seats listed are the two economy seats we have DFW-MIA. Seems pretty weird...