Hi. As you can see my posts, today in my archdiocese, altar servers who are not EHMCs do not administer Communion. Other may disagree with that, perhaps because there is no law to prohibit it. In my archdiocese, EHMCs are specifically appointed by the Archbishop, and their appointment would go through quite a process. So that would rule out any unauthorised person to administer the Communion.
In your case, I would give it a benefit of the doubt, and maybe the altar servers mentioned were EHMCs too, and if they are not, I would say it is quite irregular, especially in today’s context. More and more, emphasis is given on the reverence for Communion which can only be given by ordinary ministers, and at the minimum, extraordinary ministers.