Center Sliding Window Defogger not Working Properly

[Strathem]

Hi Guys,

 

I'm having an issue with my rear center window defogger. It's a sliding window and both the left and right panels defog normally. The middle window seems to only work at 50%. I checked the current across the panels and found that the middle panel is about half of the left and right so it makes sense that it's only working half as good i suppose. Is this supposed to be how it works? I checked the connections from the passenger panel to the sliding window and they seem intact. 

 

It's a 2015 2500. I've had the truck for 2 years now. Didn't notice it happening the first winter I had it, but it's bothered me this last one. It's really more annoying than anything, but was wondering if anyone ran into the same issues. Thanks in advance.