Heating pad is not the same as heat plate and can operate 30 degrees or lower than the average heating plate.
I get that you prefer your set up and I'm sure it works well, but a lot of people on here successfully use plates and pads and if that's what someone wants to do, providing them with...
Probably too late to change it, but the heating pad should be on the underside of that grid. Young chicks want to be able to press against it safely for heat, and as others noted pressing against the wire could trap wing tips or heads.
Or Glad Press N Seal it very snugly so there are no gaps...