"The
Stobi puzzle" is just another way of saying, our attempt to establish the chronology of Stobi's coinage, the relative size of the issues, the
denominations of the coins, the significance of the coin
types, and possible reasons for the issues.
These are the same tasks we would like to accomplish for EVERY body of ancient coinage; there is nothing particularly enigmatic about Stobi's coinage, so it is a little exaggerated to call it a "puzzle".