Ok I reread your post and first question is why are you using 2 heat tapes on 1 cage? Heat tape does next to nothing to heat air. If you need to heat the cage ambient, you need to either heat the whole room or put in a small RHP above the hot spot heat tape.
Second is what is this glass and PVC?
As for channel 1, it looks ok. Your Herpstat reading and temp gun reading are the same but your setting is higher. That means either you didn't give it enough time to warm up(is it running 100%) or the probe isn't placed right(again, would be running 100%). If channel 1 isn't running 100% usage, then you probably got a bad probe assuming like I mentioned you have it placed correctly and actually touching the heat tape and floor of the cage only.
As for channel 2, it seem fine. Setting and Herpstat temps are the same and gun temp is low which is normal as you are heating through the PVC.
Now I'm assuming this is a newer Herpstat that has the power level control and its set for 100%. I would reposition the probe and master reset the whole unit and go through setting by setting and then wait an hour and see where you sit. I've had 5 Herpstats and never had a problem unless it was user error my part. I've even squished probes by setting cages on top of them and they still worked although the probe wire was kind of flat instead of round lol.