I guess that you are using the simple location field, which, depending on your browser language or if you try to add a historical place, does in general work bad, because it is using the mechanism behind is using Google Map.
Click on the "> Edit Location Details" below the field and add whatever you want, without any auto corrections (except if you have enabled auto-complete which is a browser, not Geni problem).
There was however a problem with yesterdays release where they forgot the County field, but that is fixed now.
BJORN, it is good information to know, although in many cases I see different spellings for the same town, different names altogether, and other times towns with the same names in the same or different country, which makes it very difficult when you are not from that region and can't ascertain which town our ancestors are describing.
Hopefully locations will be localized as well as a part of further internationalization (i18n), and as a part if this I have started to use the ISO language codes in the country field, which seem to be be supported already since they are spelled out in English in the profile view.
Getting correct name is however a big challenge, especially for those who are not familiar with foreign places, and if you are unsure you should just enter whatever you have from your source in the first field of the location details.