You're not seeing double! This was the one and only time (so far) that I've received two of the same picture postcard from different people in the same city and country. Top card sent by Shufen on 2022-March-15 , bottom card sent by Annie on 2022-July-14, both from Kuala Lumpur, Malaysia.
The card info says:Mount Kinabalu is a mountain located at the West Coast Division of Sabah, Malaysia. It is protected as Kinabalu Park and has been accorded UNESCO World Heritage status. Standing majestically at 4,095 meters (13,435 feet above sea level), mount Kinabalu Is also the 20th most prominent mountain in the world by topographic prominence.