https://stoker.com.ua/search/
write the city of Киев
http://prntscr.com/f11wot
Click on any category
http://prntscr.com/f11x2o
And the ads are displayed only in Kiev, although the menu is written Ukraine
http://prntscr.com/f11xt6

Please tell me what the problem
users do not know why not see all the ads

video
http://fex.net/343877103045

@Виталий Василенко
Does issue happen with friendly URL disabled?

Friendly links are enabled.

Tried to disconnect, did not help.

First please answer my question.
Next, try to create test city in latin (not azbuka) if this is issue with charset.

"Please help" in message is absolutely irrelevant and will not help to resolve problem.

@Виталий Василенко
Does issue happen with friendly URL disabled?

Added country, city, region into Latin.
The error persists

Friendly links enabled --- there is an error
Friendly links off ---  there is an error

I am not able to reproduce error on our demo site, so:
- make sure you have latest theme version
- try to reproduce problem on our demo site. If not possible, I cannot fix.

Default theme - there is no such problem
Theme ZARA - there is no such problem
The theme of Veronika There is a problem

@Виталий Василенко
How could other theme has same problem as different?

Found a solution
The table:
oc_t_preference

('veronika_theme', 'search_cookies', '1', 'STRING');
Replace
('veronika_theme', 'search_cookies', '0', 'STRING');

Here is the SQL code
REPLACE INTO `oc_t_preference` (`s_section`, `s_name`, `s_value`, `e_type`) VALUES
('veronika_theme', 'search_cookies', '1', 'STRING');


You can change this in theme settings