axi_dac_load_custom_data and unwanted LO frequency bandwidth

Actually, I'm trying to make work the provided talise application without modifying the hw project. I want to test the axi_dac_load_custom_data of the provided sine_lut_iq table. My LO is at 1GHz and I have used the "tx_bw100_ir122p88_rx_bw100_or122p88_orx_bw100_or122p88_dc122p88" profile. When I tried to see the output on the spectrum analyzer, I can see the 1.002 GHz frequency(LO + base signal) but I also have a 100MHz of Bw around which is undesirable for my future application. How can I suppress that or at least can I decrease its amplitude/gain.