The .np registry is returning the wrong nameservers on their own nameservers.
Contact your registrar to fix this.
nben.com.np. 86400 IN NS ada.ns.cloudflare.com.
;; Received 75 bytes from 27.111.31.5#53(shikhar.mos.com.np) in 201 ms
nben.com.np. 86400 IN NS ada.ns.cloudflare.com.
;; Received 75 bytes from 193.0.9.102#53(np.cctld.authdns.ripe.net) in 7 ms
nben.com.np. 86400 IN NS ada.ns.cloudflare.com.
;; Received 103 bytes from 204.61.216.11#53(pch.nnic.np) in 23 ms
nben.com.np. 86400 IN NS ada.ns.cloudflare.com.
;; Received 103 bytes from 2001:dd8:12::53#53(ns4.apnic.net) in 40 ms
nben.com.np. 86400 IN NS ada.ns.cloudflare.com.
;; Received 75 bytes from 198.32.126.50#53(np-ns.npix.net.np) in 203 ms