Nah, you're good. For unknown reasons federation between kbin and lemmy.ml in particular is just fundamentally broken right now. There is some talk about this on lemmy.ml , there are a couple of threads about this topic on kbin as well somewhere, the most popular here.
Essence: Lots of speculation, nobody knows for sure, participation on lemmy.ml hosted discussions from kbin seems to be impossible right now (I tried, to no avail), federation between kbin and other lemmy instances does not seem to be impacted to the same extent, if at all?