Vouchers - random users getting assigned as owners when they are not

Noticing an recurring issue whereby JDE users who are not in AP voucher processing are being assigned on voucher batches as the owner (VLUSER on F0411Z1)

We use a specific voucher type (IV - invoice verification) and the batch type is V.

Users sometimes who know nothing about these vouchers and/or are not in AP at all will be assigned the batch and when we go to review/post we notice it.

We run R04110ZA periodically during the day and there is only an EDI - Userid process option for specific voucher type of IV.

Not sure where to look for an answer. It is almost like someone may also be running the same job, but not with AP vouchers of IV, at the same time and the USEER is somehow being stepped on.