Not overlapping when MergeSort Conveyor...

I am making a simple model using two MergeSort conveyors and elevators between them.

I want anyone's help for solving my problem.

When flowitems are transfered to MergeSort_output conveyor, they are overlapped. I want them to be transfered with spacing like MergeSort_input conveyor.

I attached the model file to this email.

I want to know the way of the flowitem not to be overlapped in MergeSort_output converor.

Help me!