In recent months, I saw old questions, answered by the question owner and there was no another answer, in the Close Votes queue.
Close reason:
This problem cannot or can no longer be reproduced. Changes to the system or to the asker's circumstances may have rendered the question obsolete, or the question does not include a procedure to enable potential answerers to reproduce the same symptoms. Such questions are off-topic as they are unlikely to help future readers, but editing them to include more details can lead to re-opening.
I usually choose "Leave Open". Because another answer may be added by someone later, although it may not work for the OP.
Should we close them? Why?