Haze, Pressure and PP are interacting oddly. I was always under the impression that Haze did not trigger pressure, as it is a non-targeted field effect; however, in testing on PS, it does. Also, the counters are inaccurate, as the hover-over counter only shows PP going down by 1, but the actual button shows it going down by two:
Replay where this was tested: http://replay.pokemonshowdown.com/gen7uu-613654353

Replay where this was tested: http://replay.pokemonshowdown.com/gen7uu-613654353