I figured it out.
Stupid me, I made my own loop cables with two conductor + shield canare mic cable – because that's all I had. Anyway, one wire (red) went to sleeve and one wire (white) went to tip, guess where the problem was… that's right, I never grounded the shield to the sleeve on one end of one cable. So, the sleeves both tested for ground continuity because of the red wire and everything appeared to be good on the outside but wasn't, hahaha.
Check those shields!
