SJ5000+ Stills ISO wierdness

Took a series of shots to test how still images looked over the range of ISOs to find out that the menu's ISO page does nothing. Whatever manual setting used photo EXIF show ISO rated at ISO51(???!!!). Haven't tested Auto ISO yet and still on Firmware v 1.7.  I tested from ISO100 to ISO800 All images look the same and shutter speed, (1/85), was the same so ISO definitely doesn't change. I've emailed SJCAM about this and await their response.