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CC2500: TX spectrum range is too width

Part Number: CC2500

Dear

Customer test CC2500 TX spectrum and found the peak value cover whole range between 2424Ghz to 2470Ghz, however their design purpose only want get three frequency point 2425, 2445 and 2470Ghz. They do the test on EMI shielded room, so it should not be affected by environment EMI noise.

Below is their TX spectrum waveform capture and CC2500 register setting, may we appreciate your help check any setting is wrong?

{TI_MCSM1,0x00},
  {TI_MCSM0,0x18},
  {TI_PKTLEN,61},
  {TI_PKTCTRL1,0x07},
  {TI_PKTCTRL0,0x05},
  {TI_PATABLE,0xFE},
  {TI_ADDR,0x01},
  {TI_FIFOTHR,0x07},
  {TI_FSCTRL1,0x06},
  {TI_FSCTRL0,0x00},
  {TI_FREQ2,0x5D},
  {TI_FREQ1,0x44},
  {TI_FREQ0,0xEC},
  {TI_MDMCFG4,0x78},
  {TI_MDMCFG3,0x93},
  {TI_MDMCFG2,0x03},
  {TI_MDMCFG1,0x22},
  {TI_MDMCFG0,0xF8},
  {TI_DEVIATN,0x44},
  {TI_FOCCFG,0x16},
  {TI_BSCFG,0x6C},
  {TI_AGCCTRL2,0x43},
  {TI_AGCCTRL1,0x40},
  {TI_AGCCTRL0,0x91},
  {TI_FREND1,0x56},
  {TI_FREND0,0x10},
  {TI_FSCAL3,0xA9},
  {TI_FSCAL2,0x0A},
  {TI_FSCAL1,0x00},
  {TI_FSCAL0,0x11},
  {TI_TEST2,0x88},
  {TI_TEST1,0x31},
  {TI_TEST0,0x0B},
  {TI_IOCFG0,0x06},