After I join computers to the domain a few accounts dissappear…

So I join 30 computers to the domain on Tuesday morning and when I get to work on Wednesday, 10 accounts are nowhere to be found. I double checked all systems before leaving work Tues. and they could all authenticate to the domain. I would love to find out what causes this random deletion of accounts. I can’t seem to figure if it is AD gremlins or if I am doing something wrong.

Thanks