All maps in China are transformed for some reasons, the map providers are forced to add some noises so that all points are somehow offset. Chinese call this Mars Coordinate System for fun.
I wrote an api for translating the mars’ coordinate, you can request http://chillrain.com/api/wgtochina.php?latlng=50.926888%20116.391046.
Don’t do it too frequently, it has a request limit.
So welcome to the mars!