How was Kalapani encroached upon? And what is the dispute about?

Shrestha: In 1962, there was a fierce war between India and China which India lost. After the fighting stopped, the Chinese Army retreated to its original border. The Indian Army looked around and found Kalapani to be a strategically advantageous point. There is a 20,276-foot-high hill which they thought could be useful as a stronghold from where to fend off the Chinese Army. At a meeting of the technical committee, Nepal had proposed to resolve the Kalapani dispute using the maps of 1850 and 1856 as the basis. But India wanted to use the map of 1879. Since the Indian map was irrelevant to Nepal, it rejected the proposal. What is interesting is that Kalapani is shown to be on Nepali territory on the maps submitted by Nepal and on Indian territory on Indian maps. In the map taken as the base document by Nepal, the Kalee River is shown as the frontier. The facts have been distorted on Indian maps, and the river has been renamed as the Kuti Yangti River. As India has changed the name of the river, the dispute remains unresolved.