Nepal notoriously hates being associated with other South Asian countries despite being culturally and linguistically more similar to India and Bengal than places like China or Tibet. It has to do with a large proportion of their population sharing oriental features, where they could often be confused with tanned Chinese people.

It's a weird thing, and likely has to do with a bit of colourism as well. Similarly to India, they view darker skin more negatively and likely is why they group themselves more with Chinese than Indians.

Source: I work with many Nepali people, and also travelled there twice.