Maybe the pilot felt uneasy with the tailwind component on 02. But hard to believe they would go to the opposite runway without giving any indication to ATC in particular after the exchange:
KTM-Tower: "BanglaStar211, wind 220 degrees seven knots, tailwind component six knots, runway 02 you're cleared to land."
BS211(female voice): "Cleared to land, BanglaStar 211.