Whoops! Page Not Found on page 2+ when searching or refining
I have several problems when try to filter (with advanced search) or refine the results.
Infact if the custom field have values with more than one word, if I click on the second page then appears "Whoops! Page Not Found."
I found also where is the problem but don't understand the cause.
The problem is that when for example I search for "In vendita", the url of the first page is:
instead, if I click on the second page, the system (Wordpress or Classipress?) delete all the +, so values with two words are not right:
I don't understand this behaviour, please can anyone address me to correct it?
Thank you in advance for your answers.