I've collected several favor coins today and they're not showing the "+XX" (number of favor points). After this happened a few times, I checked my favor points at a shrine immediately before and after collecting a favor coin, and it did add the favor points -- it's just not displaying the +favor indicator when the coin is collected. (It seems to be random; from the time this morning that I first saw it _not_ display the favor gain, it's sometimes displayed it and sometimes not.)