Mass Cost Change Not Working

I do a mass cost change in HQ to change item costs at all my stores. When the HQ client runs at all the stores it processes the worksheet (401 i think) without any errors. But when you go in manager at the store level and look at the costs of items that were changed they have not changed at all and i have to go in and individually change each one of them. I'm not seeing errors or problems so I'm kind of stuck. Any ideas? Thanks in advance!