EPO creates an instance of itself in Registered Servers by default during its install as part of some requirements that I do not believe are needed afterwards but I am not positive about that. As you confirmed the instance does not get updated after a migration so all of the wrong information would obviously cause a problem if it were needed. I would leave it alone just in case.
Thanks for the info. I agree it's probably best to just leave it alone if it's not causing any trouble,