WordPress with Plugins??

Hello, I am web developer i am in process of updating my current which was done with HTML, CSS, PHP, JAVA SCRIPT, to WordPress Platform, i have installed latest wordpress then installed several plugins including a WPML CMS multi language plug in order to make the site better and function in multi language (English, Persian), the current issue i have right now is everything on the English side including the navigation works good, but when i visit the Persian pages there seems to be an issue with the navigation Because the navigation works but the letters and the text inside the menu are not showing or cut off, i am not sure if there is an issue with the text, size, div spaces or space between the letters or inside the boxes, i have also tried editing the CSS line 161: removing the display and changing float to right, but as soon as the CSS is edited the WordPress theme no longer works and the site only shows the logo, links, txt, etc, so can you let me know what is causing it and how to fix it…..??

WP Site:

Persian, https://www.yashdesign.com/ywp/?lang=fa

English, https://www.yashdesign.com/ywp/

Previous site with Edited CSS (with issue):

https://www.yashdesign.com/mywp/

let me know as soon as possible, thanks.