Some sensors are doubly detected?
Yes, this is still a problem. It is partially solved by alias detection and confidence values in sensors-detect, but it is really tough. Double detections can be caused by two things: sensors can be detected to both the ISA and the SMBus (and if you have loaded the approprate adapter drivers, it will be detected on both), and some chips simulate other chips (the Winbond W83781D simulates LM75 chips on the SMBus, for example). Remove the offending adapter or chip driver, or run sensors-detect and add the ignore= modprobe parameters it suggests.
Yes, this is still a problem. It is partially solved by alias detection and confidence values in sensors-detect, but it is really tough. Double detections can be caused by two things: sensors can be detected to both the ISA and the SMBus (and if you have loaded the approprate adapter drivers, it will be detected on both), and some chips simulate other chips (the Winbond W83781D simulates LM75 chips on the SMBus, for example).