Fold down rear seat question (ML320)

RE: 98 ML320
I cannot get the back seat to sink completely down. The back folds down when pulling up the knob, then when turning the lever on the seat-side, it
goes to the first forward position, but the lever will not move again for the seat to completely sink down.
This is the double seat, driver's side, not the single one.
Any ideas what to look for??
--
Thanks & B'rgds,

Uncle Vinnie
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