Mayflash Gamecube adapter LR triggers always on

Using the latest drivers/firmware from Mayflash's website doesn't seem to change anything. This happens with every GC controller I plug in.
This guide sheds some light on exactly the problem I'm having, however the fix only works with the adapter on that site.
Below are the default settings:
I've tried modifying the calibration, which does set the analog Rx/Ry values back to 0, however it also throws both joysticks completely out of whack. It's either one or the other.
Unfortunately every game is unplayable right now due to the triggers setting any and every button assignment to R-/R+!
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Are Mayflash GameCube adapter good?
Excellent product, does exactly what I wanted it to. If you're looking to use this on Dolphin emulator you CAN but make sure you get the official driver from MayFlash first. The generic game controller driver from Microsoft won't be as well calibrated and might not support force feedback.Does Mayflash have input lag?
Lowest 1-2ms input lag for all platforms-MAYFLASH Limited Game Accessory Manufacture.How do I use Mayflash GameCube adapter on switch?
Mayflash GameCube Controller Adapter The Mayflash adapter is a simple adapter that you just plug into your Switch's USB port on the Dock, and it has four available ports for GameCube controllers. Just plug in your favorite GameCube controller, and you're good to go!How do I update Mayflash GameCube adapter?
Download the firmware from https://www.mayflash.com/Support and install it on your Windows PC.Mayflash GameCube Adapter Setup For Dolphin 5.0 - 2022
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Images: Gareth Willey, Karolina Grabowska, Karolina Grabowska, Karolina Grabowska