32x64 with U2 instead of B2 has bad output

[launchd]

I have an old 32x64 display that I can't get to properly display the demo. The panel is labeled as HUB75D (P3.0(2020)32-64-16S-V2.4) (dated 2013/06/01) with SUM74HC245T chips near the input. Where I would expect to see a B2 pin, it is labeled as U2 instead. I'm using a Raspberry Pi 3 Model B v1.2 from 2015 to run the demo (sudo examples-api-use/demo -D0 --led-rows=32 --led-cols=64 --led-no-hardware-pulse --led-slowdown-gpio=2). There is a 5v power supply to the panel.

With full power, the display shows multi-colored vertical bars that scroll from left to right. However, when I remove the power to the display, I see what resembles the spinning square from the demo but in all red, since it has very little power. This is only the case when I use --led-slowdown-gpio=2. This leads to believe its a logic level issue? I'm just not sure which part to get if that's the case.

I've double checked my wiring and I'm using the shortest jumper cables I have. Here is the wiring I have:
32x64 Panel, RPi GPIO
LAT, 7
CLK, 11
G1, 13
A, 15
U2 (B2), 19
G2, 21
R1, 23
GND, 6
OE, 12
B, 16
C, 18
D, 22
R2, 24
B1, 26
GND, 14
GND, 20

(without power)

(with power)