chaged a label in a menu is displayed incorrectly at drop down menu

Hi all,
 chaged a label in a menu is displayed incorrectly at drop down menu.

for example
 1, made a folder as "PSFT_STANDARMEUN" that including standard menus
 2, and then made test menu using " Add Content Referenc " option as lable is "test123"
first time, i chaged the lable as "test456" in the test menu at " Content Ref Administration " ,
the value was correctly display at drop down menu
second time, was changed to "test77" but the lable is not changed at drop down menu still "test456".
may be 4 ~ 5 hour later changed it correctly at drop dwon menu

i think that is cache problem.