I just did this and the first time through the bar I get Kick on 1,3,4 - the next time I get Kick on 1,2,3.
This seems right to me. The ‘neighbor’ track (the N of NEI) is track minus 1. So I’m guessing track 1 has no neighbor track since track 0 doesn’t exist, and the neighbor is just itself. It’s behaving as expected in that way.
If for some reason you’re talking about the SD on track 1 and BD on track 2… I get kicks on 1,3,4 for every bar. This would seem to mean that because the neighbor track (1, SD) has no trig conditions, the default comparison results in ‘false’ for beat 2 (NEI) thus no trigger, and then false again for beat 4 (/NEI) thus a trigger. Again, this seems correct.