FCS reflector problems

[KE2SJ]

I'm using a FT-2750 into a mmdvm hotspot with pi-star. I can access YSF reflectors just fine. I read that you need to use DTMF tones to link to FCS rooms. But when I key up a particular FCS reflector, I end up linked to a different reflector (for example, I key in 00100 and end up in 00137. Looking for why this is happening and how I can resolve it. Thanks in advance.