Cactus V6 II, Fuji XT3, and Nikon SB900

I flashed my XT3 with the fuji firmware, but am having issues with power modulation not working on the SB900 with TTL on. The SB900 shows TTL FP correctly.

I can't control the power no matter what I do on the V6 II.

F-stop and aperture adjusts correctly on the flash based on the camera, but ISO does not. The cactus V6 II shows the ISO correctly, but the flash is stuck on ISO 900. I tried a factory reset on the flash and the cactus, but no luck.

Does anyone have an idea what might be causing this?

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