The glyphs in the Bravura font for

U+01D123 MUSICAL SYMBOL F CLEF OTTAVA ALTA
U+01D124 MUSICAL SYMBOL F CLEF OTTAVA BASSA

have a small 8 floating way above the F clef for the ALTA variant, and a small 8 just touching the top for the BASSA variant. Shouldn't they be just touching the top of the F clef for ALTA and the bottom for the BASSA?

I've spoken to a music notation expert who says that the two glyphs in Bravura are wrong. The OTTAVA BASSA clef is used rarely, but sometimes for very bass instruments such as the contrabassoon.