Hi Mike-
Are you 100% sure you’re not hearing the built-in mic on the camera? Like maybe the switches on the camera were somehow set to “internal/on-camera mic”? Because that sounds to me like what you’re hearing. The ME66 a foot away from the talent shouldn’t sound that hollow.
Do you have access to the camera to see if the audio settings/switches were set up correctly?
Assuming you are, in fact, hearing the ME66, it sounds like the room that you did your recording in was large with hard walls and no carpeting.
Dave