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I don’t see anything wrong. As far as I understand: a 720×480@60i frame contains two interleaved fields with 720×240 pixels each. Since the OSSC isn’t a HQ deinterlacer, in Line2x-Mode it simply separates those interleaved fields (resulting in 720×240@60p) and doubles their height ( -> 720×480@60p) = simple Bob Deinterlacing.
… for 480i the Line4x-Mode should result in a 960p output.