CPU-Z is showing the matched pairs in slots 1 and 2, and 3 and 4. If that is correct, they are in the wrong slots for best stability. The MATCHED pairs should be in opposite channels of the same set of slots. According to page 1-9 of your motherboard manual, the 2 x PNY sticks should be in same-color slots and the 2 x Supertalent sticks should be in the other color slots. Dual channel memory relies on the timings, voltage, lot, brand be identical. That may be why your 1st pick of CPU-Z shows only single channel.
Also, I noticed that the timings for the RAM is slightly different. That may be an issue too. You should really try to keep all sticks the same for dual channel memory.
So look at the 4 DIMM slots and see if the matched pairs are in same-color slots.
1) If not move them where they belong.
2) If all is well, remove the 2 Supertalent sticks and run with just the PNY sticks in the correct slots. See if the issue is gone.