AD Computers vs. Domain Computers

‘Ello all!

This has been driving me nuts for awhile.
Took over all IT duties for a small law firm. Previous “IT guy” named the computers things like “TEDSNEWPC” and “JOESLAPTOP”. I am renaming them to SEDPC01, SEDLT01 and so on. Well, I notice in AD that HALF the computer are listed under COMPUTERS and the other half are listed under “ COMPUTERS”. Yet everything works fine. The computers in plain old COMPUTERS are certainly in my domain, but not in ADUC?!? Doesn’t seem to be affecting anything negatively.
Can I just drag/drop or MOVE them into the Domain with no negative effects????
Apologies if this is a dumb question. 😉