This tells me that the contact group list is not synchronizing with your Exchange Service. This could be handled 1 of 2 safe ways. One, your Exchagne service may only populate changes to your GAL once a day and you may need to simply wait 24 hours.

2, if you imported your contacts into your Exchange service, it may be possible to check this information was exported correctly. Standard migrations have you export contact and calendar items to a .CSV that can be opened using Microsoft Excel.

Check to see if these groups are listed and simply import them again into your Exchange mailbox. PLEASE select do not import duplicates.

Keep us posted.