More Rx power than Tx on SFP DOM

Hi everyone,
I actualy use 2 cisco catalyst 2960 24TC-L, both with one SFP (AXCEN AXGD-5854-0511 SFP-1000SX-DD), with 2 fiber (TX RX) 50/125 between, 15m lenght.
My goal is to monitor the power of each link, but i have more power on RX than TX...
My case for exemple :
          - TX switch 1 : -6.2dBm
          - RX switch 1: -5,7dBm
          - TX switch 2: -6,9dBm
          - RX switch 2:-4,8dBm
I run iOS 15.0 on both.
I havn't found any problem like that on the net.
Is this normal ? Recurrent on this hardware ?
Any suggestion ?
Thanks for your help
J-C

Up ?

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More Rx power than Tx on SFP DOM

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