When swiping on reader of door 3 or door 4 on one SCU1284, door 1 or door 2 will be open instead. The transaction shows "Reader Exit".
Door 1 or door 2 is set to dual direction entry. So the reader on door 3 or door 4 is regarded as the exit reader of door 1 or door 2.
Set the "Exit Reader" option for the door to "None".