Only one plutosdr is recognized even more are available

[F5OEO]

I have 4 plutosdr devices on the network. SoapySDRUtil reports :

######################################################
##     Soapy SDR -- the SDR abstraction library     ##
######################################################

Found device 0
  device = PlutoSDR
  driver = plutosdr
  label = PlutoSDR #0 ip:plutoprod.local
  uri = ip:plutoprod.local

Found device 1
  device = PlutoSDR
  driver = plutosdr
  label = PlutoSDR #1 ip:fishball.local
  uri = ip:fishball.local

Found device 2
  device = PlutoSDR
  driver = plutosdr
  label = PlutoSDR #2 ip:libresdr.local
  uri = ip:libresdr.local

Found device 3
  device = PlutoSDR
  driver = plutosdr
  label = PlutoSDR #3 ip:antsdre200.local
  uri = ip:antsdre200.local

Sigdigger seems to enumarate 4 also but only one is pushed :

[INFO] Opening PlutoSDR #0 ip:plutoprod.local...
[INFO] Opening PlutoSDR #0 ip:plutoprod.local...
[INFO] Opening PlutoSDR #0 ip:plutoprod.local...
[INFO] Opening PlutoSDR #0 ip:plutoprod.local...