I apologize but not clear about the query.
In AD you have 132 objects (are all of them are machines or other objects also). 62 of them are synced to the ePO server. After syncing 62 objects, did AD sync task failed? If failed then what was the error message it fails with?
Are you sure that you didn't exclude any of the OUs from AD sync?
I ask my client and they did not exclude any OUs in their AD,
anyway thank you for your advice.