Its not uncommon for a bank to HP one CRA and also SP another at the same time. Comenity Bank does it all the time
Getting an Amex at 626 is hard enough, getting a Discover as well might have been pushing the limits of the credit gods. Discover has approved low scores before but very much at their discretion. Discover is and to me anyway a magic eight ball shake away from determining when one gets approved
No kidding. I'm still amazed I got a $2500 Discover IT in March with my TU in the 620's (it's close to 660 nowadays).