Just have been aware from a user that he/she can not give reputation twice to the same person.
So in case answering two question in one post you would end up with one reputation or answering two separete topics for the same person would end in the same manner for the OP:
You must spread some
Reputation around before
giving it to xxx again
You can end up without your points or the user can choose someone at random just to give you the points next.
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