PROBLEM Menu items in the administration shown in wrong order

[neden]

Hi,

I am working on quite a big clinic site (215 pages) on version 3.3.13. I started by adding the site structure (all menu items) because the content would come later on. So now i am adding all the content to each page and saw that the menu structure in the administration is not the same as on the frontend. In the frontend it is alright but in the admin section it is wrong. So now it is very hard to find the page that i need to update.

Does anyone have an idea where to look for the error? Debug-Mode did not show any hints.

I am using quite a lot of plugins:
http://get-simple.info/extend/plugin/dynpages/81/
http://get-simple.info/extend/plugin/gsc...eurls/900/
I18N Base
http://get-simple.info/extend/plugin/i18...ields/100/
http://get-simple.info/extend/plugin/i18n-gallery/160/
http://get-simple.info/extend/plugin/i18n/69/
http://get-simple.info/extend/plugin/i18n-search/82/
http://get-simple.info/extend/plugin/mld...etter/310/
http://get-simple.info/extend/plugin/new...dated/541/
http://get-simple.info/extend/plugin/new...ddons/835/
http://get-simple.info/extend/plugin/ts-...lacer/799/
http://get-simple.info/extend/plugin/migrate/966/

I tried to deactivate some plugins that i considered save to deactivate without loosing content (fastreplacer, migrate) but they had nothing to do with my problem. 

Some screenshots in the attachement to show the problem.
I opened the pages again and checked if the options are set all right and they where. Opening and saving again did not make a difference.

Any help appreciated!

Thanks!
Niki