Actility US915 Channel & frequency Error

Actility US915 Channel & frequency Error

Hello all,
  There I meet a question, the result is the interop test fail.
  Let's view this picture. 
  In this picture, my module send data using Channel_15(US915 905.3MHz) everytime. 
  Show as ThingPark Wireless Logger, we can see the details, the platform received those uplink data, while the frequency is right, but the channel is LC14. Under Normal Circumstance, it shoulde be LC15.
  For this reason, my interop test failed.

Looking forward to your reply.
Thanks.