Lane Latency

I am using a ZCU102 board with a ADRV9009-W/PCBZ.

I noticed when I repeat following commands:

echo 1 > /sys/kernel/debug/iio/iio:device3/initialize
echo 1 > /sys/bus/iio/devices/iio:device3/multichip_sync

The Rx lane latency is not always the same, sometimes it is:

/sys/bus/platform/devices/84aa0000.axi-jesd204-rx/lane0_info:Lane Latency: 1 Multi-frames and 102 Octets

or

/sys/bus/platform/devices/84aa0000.axi-jesd204-rx/lane0_info:Lane Latency: 1 Multi-frames and 103 Octets

When I only repeat the multichip_sync command, then the Lane latency will keep increasing.

Is this normal behavior?

Where can I find the tx latency? (Now I use "grep "" /sys/bus/platform/devices/*.axi-jesd*/lane*")