the “525p” is normal, OSSC shows the number on lines, not the resolution so, “525 lines progressive scan” = 480p
You can check if the “Allow upsample2x” setting is set to ON in the “Sampling Opt.” menu. If so, try OFF to see if it improves things (less “analog-esque” look).
Are you sure the 480p is set to 2x ? and not another output resolution ? Check on your TV itself, probably the “info” button to see what is the resolution your TV receives.