Model 203 negative PP voltage?

[marpi82]

I think is something os wrong with phase-phase voltages I have read from my meter. I don't know it is a model issue or pysunspec2 lib.
But them shouldn't be negative and should be nearly 400V

common:
  ID:  1
  L:  65
  Mn:  WattNode
  Md:  WND-3Y-400-MB
  Opt:  Export+Import
  Vr:  31
  SN:  None
  DA:  None

ac_meter:
  ID:  203
  L:  105
  A:  42
  AphA:  7
  AphB:  12
  AphC:  21
  A_SF:  -1
  PhV:  23781
  PhVphA:  23781
  PhVphB:  21741
  PhVphC:  23619
  PPV:  -25609
  PhVphAB:  -26043
  PhVphBC:  -26313
  PhVphCA:  -24472
  V_SF:  -2
  [...]

[shelcrow]

What are the actual values in the modbus register?