Do I have to do anything if I have doubts that one of the meals I distributed to the poor reached a single person twice, or that one person took two meals?

In expiation for an oath (kaffarat al-yameen), it is obligatory to feed ten poor people. It is not permissible to feed fewer than this number or to repeat feeding the same poor person. If it is highly probable that the person who took two meals is truthful that one of them was for his companion, then it is as if you have fed ten. However, if there is no strong probability of his truthfulness, then an additional meal must be given to another poor person to complete the number.