We're using alternate definitions: I'm using "my null hypothesis", as in my zero-numbered hypothesis that I would then attempt to test for. You're using, presumably "the Null Hypothesis" as a specific hypothesis suggesting that two populations have no causal relationship [IIRC]. My null-ordered labelling just confused my hypothesis with a particular default used in some statisitical arenas AFAICT.
idanoeman's use of "null hypothesis" is far more standard than yours. And if you use such a phrase in a highly non-standard way, you can't be surprised that people think it means something other than what you meant...