user manager is used 98% - help me?

hello
i have router board 1100
my database is 1,4 mb but the user manager give me used 98%
why is it?
info:
I reset the database in RB 1100 and replace the database is taken from router bord 450g
please can any one help me ?
skype: sameer123-4

Did you try rebuild it ? (under Maintenance frame)