Flex Watt temps different - all connected to herpstat???

I have 4 12 X 11 strips of flex watt - one on each shelf of my rack and they all run at different temps??? There is a about a 4-5 degree difference between my coolest strip and hottest one. I had them pre connected by reptile basics so they are connected right. My prob is positioned between the flex watt and shelf.

Thanks for any help!

Chad

How are you measuring temps? Are you measuring the flexwatt itself or inside the tubs?

I am using an infared temp gun directly on the flexwatt.