Sequence data output (les command) 4 anchors

I’m using SPI to read the position from 4 anchors to a single tag.
I have a datastream as page 54 from the API manual says.

My issue is the index is not fixed. This is same with using the les command in a terminal.
I was expecting to receive data as AN1,AN2,AN3,AN4. But in reality this is not the case.
I get Sometimes AN2,AN1,AN3,AN4 and other combinations.

What does determine this?
Can this output order be at fixed locations in the TLV response?