IT Servrices GUI problem in big nodeid server

in GUI Configuration->IT services I add service like follow

name=1
Parent Service root
Depends on 1-1

name=1-1
Parent Service 1
Depends on 1-1-1

name=1-1-1
Parent Service 1-1

than in the page,I only can see like that
root
----1
---------1-1-1

the 1-1 has disappear,but when i edit service "1" i can see Depends on "1-1".
same problem in "srv_status.php"