BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@Booklet{EasyChair:7965,
author = {Jawad Yasin and Huma Mahboob and Suvi Jokinen and Mohammadhashem Haghbayan and Muhammad Mehboob Yasin and Juha Plosila},
title = {Partial Swarm SLAM for Intelligent Navigation},
howpublished = {EasyChair Preprint no. 7965},
year = {EasyChair, 2022}}