my guess is you are not "feeding" the geometry field with the correct data
the "natural" container for raw (default) lat lon is a geography field : 
*geography()*
if instead you want to use a *geometry()*,  you need to transform the 
original data from EPSG:4326 to another coordinates system

I use such fields in my app:

*Field('g','geometry('',2154,2)',required=True)*

this one receives transformed lat, lon from EPSG:4326 to EPSG:2154

you can easily manage your transforms with the python* pyproj* module

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