Hello @aliban
I think it might be the baud rate in emonhub:

com_baud will need to be 38400 for the RFM69Pi:

[[EmonPi2]]
    Type = EmonHubOEMInterfacer
    [[[init_settings]]]
        com_port = /dev/ttyAMA0
        com_baud = 38400
    [[[runtimesettings]]]
        pubchannels = ToEmonCMS,
        subchannels = ToRFM12,