Should I be concerned about the 59 deg temperature reading

Not knowing what the average temperatures of the i7 860 are, what were you doing before/during both of those snapshots?

I may be missing something, but that shot from RealTemp looks like you're doing great. From what I've read on TJMax: when it reaches said temperature it'll throttle and/or shutdown via the BIOS or CPU itself. I read that your (i7-860) TJMax is 100 degrees Celsius, and your shot seems to confirm that. Did you try stress testing using Prime95 for an hour or so? Then try running RealTemp again and see what's up, just monitoring it periodically to make sure your CPU doesn't have a horrible problem and melt, heh.

What I am about to say is my personal opinion and has no basis in fact. But, I do not use hardware Monitor because I don't trust it. I primarily use Core Temp or Real Temp. They seem to be more accurate. As has been pointed out, some of the readings are, without a doubt wrong. In your screenshot above it shows your +12V as 8.71V. We know that that reading is wrong, otherwise your computer would not have booted. There is too big a difference in your CPU temp and your core temps. When I run HW Monitor on my systems I get the same type of readings. If I know that some readings are wrong, why should I believe that the others are right? I don't. Personally, I don't trust the program. Others here use it and probably disagree. That is OK with me. But, if I am going to monitor my computer with a program, I have to have some confidence that the readings are at least close to accurate. In my opinion, with most of the temp monitoring programs, that is the best you can hope for, close to right. Others who want to disagree with me, feel free. It is just my personal opinion that if I get readings from a program that I know or have good reason to believe are wrong, I can't trust the other readings.

If your CPU temp is 59°C and the CPU core temps are 28°C, then there is something wrong with hardware Monitor.
CPU temp is the CPU case, Core temps are the sensors inside the CPU on each core, so it's not possible to have those temperatures.
When you get a reading like that use other apps to compare/confirm, like Core Temp, Real Temp, HWiNFO64, Speccy, etc.

No need to worry about it.

I hope you have your problem solved or at least have some peace of mind about your temp readings. If you have any further problems just post back. We have a lot of experts here who are more than happy to help.