Yes I let it pre-tune itself.
Yes I checked the in game VFR map and the frequency is the same, 111.700
I did a flight from SBGR to SBSP with ILS and it went all right, I also notived that the GS shows up quite early.
Then I went from SBSP to SBGR and the GS NEVER shows up.
Also, someone shared this thread with me:
Maybe it really is just a glitch 