Show Results From Country LIMITED?

Hi,

we are using this plugin in one of our Woocommerce web site.
Seems that the number of Country that can be insered in Show Results From Country setting are limited.
In the settings fiend there aren’t limit so we can insert all the Europe country. BUT if we insert all Europe country, in frontend the search is not made on all the country used in setting.

For example if I insert only Italy, Germany, French all street are fount. But if I insert ALL Europe countries Italian street for example are not showed no more from the plugin.

Is this a known issue? Can you check and let me know something? How we can fix this?