Can't fall through platforms with certain controllers Thread - Megabyte Punch

As the title says, I can't fall through platforms with some USB controllers. It's very strange since I can Down+Special and Down+Attack just fine.

The Xbox360 Controller works fine, but when I use my GameCube controllers with 2 different brand adapters, I can't down jump.

Not even double tapping down works. I can see down in being pressed because the down arrow becomes highlighted on the bottom left.

It works just fine if I map D-Pad buttons. It's just strange. I thought I had to do with the analog not being 100%, but I calibrated it in Control Panel and see it's -100% on Y Axis.

Have you tried pressing the jump button while crouching?

Yes, I said it works fine with the 360 controller, keyboard and GC Dpad. I also explained Down+Special and Down+Attack work fine