From team page, depth chart - clicking on the name / "i" icon to view the player card for RBs results in ONLY core and QB related abilities being displayed.

UPDATE: Found the issue.

Looking at player weights, the RB ones are exactly the same as for QBs - hence QBs attributes only displayed for RBs I view.

However... all I changed recently on weightings was to reduce one skill on RBs. QB ratings not been touched. It's as if saving copied all the QB weights to the RB weights.