Well that was a trip down memory lane 
I wonder what ever happened to that nice Emmanuel chap 
OK, so what I think you are doing is entering the coords into a Geographic Places search box ?
In that case it WILL snap to the nearest “place”.
What you need to do is get the lat/lon as text and use the Forumla "Calculate CoordToAddress.
If you want to input this as one field, then you can use an expression to split out the before and after the comma.
This way it will store the exact location.
Left = Geo Search
Right = Text coords.