Submit accounting transfers both AR and project data to GL

Good morning,

We have two different individuals who process AR transactions and project billing transactions for the same operating unit. They have found that if they are both working at the same time (one is entering receivable transactions in AR and the other is working in projects), when they run submit accounting, it picks up transactions from both AR and projects and sends to the GL. Is that intended functionality or is there a way to make sure that only AR transactions are sent to the GL when run from AR and only projects transactions are sent to the GL when run