export and import wordpress network blogs database problem

Hi
I had a wordpress multisite with one subdomain with id of 2
As I had a lot of posts in that blog, I backed up all the wordpress tables with the id of 2 from phpMyAdmin.

now I installed a new wordpress multisite and I want to import those tables to the blog with id of 7. here’s what I did:
I dropped all the wordpress tables of id 7 and imported the backup and renamed the tables to id 7.

now when I’m logged into the site, I see everything is ok. but when I log out, I see same posts on all of these pages:
https://site.com/page/1/
https://site.com/page/2/
https://site.com/page/3/

also when I change any settings in my theme, none of them are visible when I’m logged out!!

I think there’s a problem in the database importing. maybe I do something wrong.