I think the answer is that as Bishop Monckton was a chapelry of Ripon the entry is in Ripon's entries.
Looking at Ripon's entries seems to confirm this
West 1793/02/03 c West John s Wm jun Bp Monckton
West 1796/08/21 c West Joseph s Wm jun Bp Monckton
West 1797/01/11 b West Joseph s Wm from Bishop Monckton
(I gave you Joseph as well as he was a close brother to John albeit dying young)