LMC Heavy Duty Power Window - Help

[Android04]

Hello everyone again. Need some help here because I think I'm going crazy. I've searched and watched videos about the install but the other issues people were having are opposite of mine.

I installed the LMC Heavy Duty Power Window Harness kit. Everything went smooth, and installed nicely. But I have a small issue... Driver side dual switch now only controls the driver window and not both windows. Passenger side switch controls the window fine, driver side the same but the dual switch will not activate the passenger window.

I've double and triple checked all wiring and its all correct. What the heck am I missing? Or do I lose that option by running this harness?

This is on my 1985 C30; I appreciate any and all help.