What are these circled numbers?
The finger numbers are next to the notes on the left for sure.
I assumed it to be repeat section markings but there is not repeat.
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Those are string numbers. It's fairly standard convention, at least as far as I've seen, to put a circle around string numbers.
So in measure 2—the first occurrence of that notation—you'd play the E on the 2nd string, 5th fret, and the C on the 3rd string, 5th fret.