Well spotted with the Fountain Hill legislation @VictorIE.  "Route C108 ... 318 metres north-east of its junction with Belfast Road, route A522" – this suggests that the C108 meets Belfast Road. i.e. "its junction with Belfast Road". Also, 318 metres is shorter than the dual carriageway section anyway, which I measure as roughly 448 metres. So at least some of the dual carriageway is definitely C108.

The Sabre page for the C108 https://www.sabre-roads.org.uk/wiki/C108_(Northern_Ireland) calls attention to the disparity between sources, but ultimately states that it's one or the other: either
Fountain Hill is B95 up to Greystone Road, where the B95 continues south/west and Fountain Hill continues as the C108, or
Fountain Hill is all C108.

So @therealzakie I'd recommend against mapping the full 448m dual carriageway section as the B95. Either make the first bit of dual carriageway as far as Greystone Road the B95 (with the remainder C108), or keep it all as tertiary C108.