Output result confusing

[fromport]

I just ran the test on a bitaxe-ultra (bm1366)

This is the output:

Top 5 Performing Settings:

Rank 1:
  Core Voltage: 1221.78mV + 6.4500000000000455mv
  Frequency: 609.92MHz
  Average Hashrate: 567.36 GH/s
  Average Temperature: 35.95°C
  Efficiency: 23.58 J/TH

Rank 2:
  Core Voltage: 1150mV + 1mv
  Frequency: 575MHz
  Average Hashrate: 1.00 GH/s
  Average Temperature: 35.00°C
  Efficiency: 1.00 J/TH

Rank 3:
  Core Voltage: 1187mV + 1mv
  Frequency: 593MHz
  Average Hashrate: 1.00 GH/s
  Average Temperature: 34.00°C
  Efficiency: 1.00 J/TH

Rank 4:
  Core Voltage: 1224mV + 1mv
  Frequency: 611MHz
  Average Hashrate: 1.00 GH/s
  Average Temperature: 33.00°C
  Efficiency: 1.00 J/TH

Rank 5:
  Core Voltage: 1261mV + 1mv
  Frequency: 629MHz
  Average Hashrate: 1.00 GH/s
  Average Temperature: 33.00°C
  Efficiency: 1.00 J/TH

The output of 1.00J/TH on multiple tests is imo incorrect.
Probably has to do with value introduced to avoid the divide by zero error as reported earlier.