I have found, over the many years I have been purchasing and smoking Cuban cigars, that since they are “hand made” and errors happen... You can take any box of cigars, and some in that box will be tight, some will be loose, and some will be perfect (which is really arbitrary, since most of us like some variance of resistance) You can always tell a beginner, by the quality (or lack) of the roll, but even the most experience rollers will have a bad day every once in a while.
While I believe we are blessed to be smoking the best cigars in the world, remember that human beings are rolling them, and they are not going to be perfect every time, regardless of the factory or the roller...