Yep. It just rounds them to 1. But it is in valid range, i.e. between 0 and 1. I also think that it just happens during printing.
val = torch.tensor([10.0,11.0,12.0]).sigmoid()
for i in range(val.shape[0]):
    print("{:.10}".format(val[i]))

Output:
0.9999545813
0.9999833107
0.9999938011

Btw,  torch.set_printoptions(precision=5) function might help to view the output more nicely.