Like I said, "I posted a link to the how to ask for help questions because more often than not, people are given bad husbandry advice by pet shop employees."
When I first got my Jackson's I found out here that the care instructions I was given by a pet shop with a good reputation were quite wrong.
Most 1st time cham owners make serious errors because they were told to do the wrong things. No shame in that if you fix the problems before it's too late.
My chams' vet told me that by the time most people bring their chams to him, it is already too late.
You mention that "he has not been eating as much or as active", these are red flags. You can heed them or ignore them. There won't be a bunch more.
Chams hide all signs of illness for as long as possible since showing weakness means becoming someone else's dinner out in the wild.
You asked about a problem with your cham, so I really can't understand why you don't want to cut and paste the questions and provide answers to all the questions on the link that I've provided twice already (and another member has also suggested that you do so.)
Not to be cruel but....You are definitely making your cham ill because you are not meeting his most basic needs and he will surely die if you don't change things without delay.
Based on the details of your reply:
You mist him for 1 minute every 6 hours = far too little water for a Jackson's
Unless there is a dripper going in the times between, he is dehydrating, his kidneys will fail and he will die
Calcium spray on all his crickets = too much calcium which will result in calcium deposits in his organs, leading to death
AND
he needs a variety of foods, not just crickets
AND
the spray might have other things besides calcium in it that aren't good
AND
there's no D3 in his diet, so unless he is outdoors, he will develop MBD (metabolic bone disease) which is fatal
Then there are the issues of proper temperature, UV lighting, etc.
I've been trying to help you out but you seem to not want to be bothered with the requests for more info.
He's your cham to care for or not--it's just cruel if the answer is "not".