This is probably related to the split-point setting. There is a "Clefs Split At" setting which determines the split point for placing notes on the Bass or Treble clef. The default setting is C5, displayed as C5* to indicate it is middle C. Use a higher split point, such as C6, if you want notes up to a B above middle C written on the bass clef with ledger lines.

It is set from the Notation Windows Options dialog:

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