Timestamps in double buffer mode

Hello,
I am using DW3000 with esp32. I have the problem with reading rx timestamps in double buffer mode. I use your API to communicate with the module. The issue is that everytime I read the timestamps they are the same for each buffor. For example for 4 received messages I get:

  1. 880271217008
  2. 626854463829
  3. 880271217008
  4. 626854463829

Do you have any suggestion what can be wrong?

Best Regards,
Filip