Meaning of "You may well have a question"

Hi Torsten! What does it mean? You may well have a question. I ask you about construction I have never met it
Thank you in advance

It’s possible that you have a question.[YSaerTTEW443543]

TOEIC listening, photographs: A girl lying on the floor[YSaerTTEW443543]

Why do you use the word ?
Many thanks

I think it means that, " You have understood the subject well enough to question an aspect of it." ( It reflects well that you question it.)