Shipment Item Allocation FIFO Issue

We are working through some inventory storage improvements in our warehouse and we noticed an issue with the way Acumatica allocates inventory for shipments.  We are a FIFO company that distributes a product with a limited shelf life.  It is very important that we truly ship the oldest product first, based on receipt date.  We recently moved many of our SKUs to different locations and now the older lots are being allocated after lots that are newer.  From what I can see, Acumatica somehow is treating transfers as receipts and resetting the FIFO date of any lots we move.  This is obviously a huge problem for stock with a limited shelf life.  We need Acumatica to ALWAYS base allocations on the receipt date for the product lots.  Is there something that we don’t have set correctly, or is this behavior by design?