Change in lattitude and longitude values of google map

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ASP.NET

google-api

I have made an application where in google map is implemented,

(1)User Pin point the the location , based on this latitude and longitude retrieved and stored
(2)Location based search is done for user based on the values set , and pin point is set base on that value in search result

=> issue is , when i move pin point longer distance it changes the longitude and latitude while for small movement of pin point do not change the latitude and longitude


is it something to do with my code, or google API?

Please help me with the solution,