Ok I have discovered something very interesting
Everything works fine if the item being retrieved from the URL has no odd characters and no spaces. If a space is introduced to item in the URL, the “Get from URL” will write in the database a blank entry.
For example:
country=USA will write as USA
country=Great Britain will write as empty because of the space
country=Baden-Württemberg will write as empty because of either the “ü” or the “-”