The 3rd temperature reading is invalid, most probably because this input is not connected to the ITE sensor. Each mainboard uses a different method of sensor connection. If the BIOS of this DELL machine reports the sensor values and you send me a photo of this screen, I'll try to adjust the sensor values for this machine.
The CPU DTS sensors are internal in the CPU (near hot spots) and the ITE sensor is an external chip on the mainboard to which various diodes across the system can be connected.
Hey, I know this is an old thread but this issue* still exists. I have an Intel DP43BF motherboard with an ITE sensor, with similar weird readings. Even the +12V rail isn't properly detected. Photos attached (both HWiNFO and BIOS).
*Of course, if it's just an unconnected sensor pin then I guess it's ok to ignore it?
p.s. I've been using HWiNFO for a while now, I really like it and appreciate the work that has gone into it.