some times Routers doesn't work

Hi, I have a Big site and i Written by Phalcon, And Everythink is okey. but for example when i navigate to some page (example: single post), dosen't show single post and Instead show Home Page .... Why ? my Router for Single Page is :

$router->add("/v/{key:[a-zA-Z0-9_-]+}/:params", "V::index");

My Website: https://vitreen.net/

and Single Post: https://vitreen.net/v/k8zzKG4-ii/%D9%81%D8%B1%D9%88%D8%B4%20%D9%88%DB%8C%DA%98%D9%87%20%D9%84%D9%BE%20%D8%AA%D8%A7%D9%BE%20%D8%A7%DB%8C%D8%B3%D9%88%D8%B3%20k555

Sorry For Bad Type English.