|I'll trade you your camera for an I5!! ;-)
Yes, they can look like B&W.
Remember, your camera sees heat not reflected light (digital camera).
The heat signature is not as defined in objects that are close to the same apparent temperature.
You may get a washout effect because of convection affecting adjacent components.
In the scan you posted, you have a 35° Delta T in the panel (which appears clear) and a 15° Delta T on the circuit breakers (and probably much less than that if you move the box down into the fuzzy area).
Any scan that you take that looks like a perfect black-and-white photograph, you probably do not have any significant heat source in the panel.
You just need to buy a cheaper camera!
Your depth of field can also cause this effect (but not apparently in this case). If you are too close to the object with a large geometric signature with a low FOV lens, everything in the panel may not be in focus.