I have given the documents another look-over, but still didn't find any glaring errors.
Why is this sentence possible I don't understand why the past simple is right here?
Past simple corresponds to a precise moment in the past like the first action (to give).
The choice of using present perfect implies that it has a relevance to the present so we can think this action was done recently so if the first action was done recently, the second should be also done recently so the tenses chosen should be the same.
What is wrong with my way of thinking?