See this, I am tired to type all of the reasons. KL-Selangor border relation was incorrect in the few last dayhttps://www.openstreetmap.org/changeset/87533994#map=16/3.1519/101.5872
Correction, these seems like a website called Smolpotato that using OSM data.
https://my.linkedin.com/in/edmondyap
BTW, I am grateful that they use OSM data, but you know the nomitation in Msia is problematic due to different locak government/District or postal code area.