API - Number of phases (pnp) - not displayed correctly

Based on the api response:
"nrg":[236.5299988,234.9799957,236.2200012,1.860000014,5.889999866,5.927999973,5.889999866,1353.035034,1344.906982,1359.057007,0,4056.999023,97.11978149,96.5502243,97.68006897,100],
"pnp":1

as nrg = energy array, U (L1, L2, L3, N), I (L1, L2, L3), P (L1, L2, L3, N, Total), pf (L1, L2, L3, N)

I would expect pnp to be 3