[mk05]

It rather sounds like it was humid when and where you were smoking. When a cigar tunnels, it is a sign of either:
- non-corresponding age of tripa and capote
- high ambient humidity relative to the cigar that makes the capa and capote not burn as fast as the inner tripa that is not as exposed

Of course, the cigar could have been dry coming into the shop but looked moist at the shop due to humidification element, and dried out immediately and into drier equilibrium once out of the humidor.