Did I mess up my humi?

I recently received my new "Charleston 150 Cigar Humidor". It has seven drawers and one giant wood/glass door. When I received it I noticed that the door was not air tight, in fact the gab between the door and the rest of the humi was so big that every time someone gave my desk a nudge it would bang off the humi a few times. I moved the bracket inside the humi such that the door now shuts very well. I mentioned this to the people I bought the humi from and they said:

"You actually do not want to have an airtight seal on your humidor. It needs to have air exchange with the outside, which is why they are built to not be airtight. A true airtight seal in your humidor will create mold on your cigars and or the interior of the humidor."

I am using propylene glycol not distilled water and I will be opening the door a minimum of once a week so I really didn't think mould could be an issue. I have not moved any of my cigars into the new humidor because I am still seasoning it but now I'm not so sure if I should leave the bracket where it is or move it back. Any suggestions?