@Jan *****************
some clarification about that re-entry stamp : the visa was already used by entering Thailand, thus it would be impossible to re enter on the same visa.
But that 60 day entry stamp would have been kept "alive". And would have been possible to still use that 60 day entry stamp. This is an important distinction because when OP would have re-entered Thailand with a re-entry stamp they got afterwards, they would NOT have gotten another 60 days entry stamp, BUT only to the day the original entry stamp specifies. (The remainder of the days which was specified by the original enrry stamp)
So OP stayed 34 days, flew out and let's say about 6 days later flies back in, then there would have been only 20 days left to stay. Thus giving less days than a simple visa exempt.
It doesn't activate a new round of 60 days.
All of this because the distinction between what the visa actually is, and what the entry stamp actually is.