The low RSSI values (the more negative the number, the weaker the signal) suggest - as Paul pointed out - the “unreliable content” flags are the result of a weak signal.
At -105 dBm, the signal is only about 10-15 db above the noise floor.
You might try adding a ground plane beneath your emonTX and emonBase. Any metallic object cut to a circular shape, with a radius the same as the length of your antenna will help considerably. For best results, use one with both devices.
This thread has more info.