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By default the TXLED# and RXLED# lines should be high so when the device is plugged into the power bank, the LEDs arent expected to be on. I configured two other GPIOs since GPIO_0,GPIO_1 arent present on the GPIO header on our DVK and checked for the above two cases. When the device is self-powered and not connected to the host, both the lines are pulled high and on connecting to host and switching to I2C mode to perform data read, the RXLED line goes low followed by TXLED. Please find waveforms for both the cases attached.
Could you try checking for the output on the pins directly?