LimeSDR USB with BAND2 TX problem

Hi, I am testing LimeSDR for GSM communication using Osmocom projects, operating band is GSM900.
I configured tx-band is BAND2, but 2 TX ports (TX1_1 and TX1_2) transmit simultaneously with power is around -60dBm. When I configured tx-band is BAND1, only TX1_1 port transmit and power is -10 dBm. So was my LimeSDR broken?

Tagging @Zack for comment.

Do you have the same situation when testing with LimeSuiteGUI?