It is possible that a certain proportion of his project reimbursement must be reimbursed according to labor costs. He used the student's account to reimburse the service fee, and the financial department directly transferred it to the student's account, but he was not going to give it to the student, so he went back, that is, borrowed your account to reimburse the fee.
This is how tutors avoid taxes. In universities, tutors often get some bonuses and rewards. If the money is directly transferred to the tutor's card, a lot of taxes will be deducted. Therefore, it is generally transferred to students, and then transferred back by students to evade taxes.