HVAC York diamond 80 furnace A/C
It's definitely wired wrong. You need 4 wires to your stat R to Rc and Rh or R and Rc (it's hard to tell from the picture) bottom line is all three R's go together obviously using the red. W to W using the white. G to G using the green. Y/Y2 to Y using the yellow. That's it! Get that blue one outta there. The other 2 conductor cable is for the A/C one goes to C and the other to Y/Y2