Dunno what happening but if i configure gpus manualy it doesnt show me 1 of the gpus.
If i run default it shows me 5 gpus but if i do manualy only show me 4 gpus, this is how i done it:

"gpu_conf" :
[
   { "id" : 4, "intensity" : 59, "worksize" : 16, "threads" : 2},
   { "id" : 3, "intensity" : 59, "worksize" : 16, "threads" : 2},
   { "id" : 5, "intensity" : 59, "worksize" : 16, "threads" : 2},
   { "id" : 2, "intensity" : 59, "worksize" : 16, "threads" : 2},
   { "id" : 1, "intensity" : 59, "worksize" : 16, "threads" : 2},
]