Few Categories And Subcategories Disappeared

[Sanypresta]

Hello,

 

I am newbie in Prestashop. 

 

Suddenly all subcategories and few categories from top menu disappeared. They are not shown in frontend page. The main menu shows only part from my categories and no subcategories.

I see the subcategories in admin panel, but when I click to edit nothing happens. Just the page blinking and returns me in categories page.

 

What is the reasion?

 

Thank you in advance

 

 

SERVER INFORMATION

Server information Linux #118-Ubuntu SMP Thu Dec 17 22:52:10 UTC 2015 x86_64

Server software version nginx/1.9.9

PHP version 7.0.1-5+deb.sury.org~trusty+1

Memory limit 128M

Max execution time 30

MySQL version 5.5.46-MariaDB-1ubuntu0.14.04.2