What version of the field are you using? Try to install the latest version.

The problem was fixed after geo field V8.83 (Bootstrap problem)

See here and here

In map template file in line 48 find

map_canvas_ img { max-width: none; }

and change to

map_canvas img { max-width: none; }

There`s no such line. The most similar ones look like:

map_canvas_id;?>_id;?> img { max-width: none; }

It became better with another, bootstrap based, template

It looks as expected. Controls are fine now