Are you sure it's not a crack, from the cutter blades putting pressure from the sides before they start slicing? I've noticed that with dull blades or very thick/tough wrappers the cigar will start to smoosh out of round, and have cracks as a result.
Where do you store your cigars? Is the cut always in the same spot?Could be a wood splinter or nail in your humidor.
At first glance, I'd guess that somebody poked that hole with a fingernail. Is this happening on different cigars or all from the same box?Could be that somebody at the rolling table was getting sloppy. Or maybe you are the one doing it. Are you finding the defect before or after the cut? If you are only noticing these defects after the cut, I'd say you need to carefully study how you're holding it while cutting. I noticed this post is about two months old so, have you had any more problems? Or have you figured it out?