iCade Bluetooth plugin for my VR headset release not triggering

[fuzzballb]

Recently I bought this (http://www.aliexpress.com/snapshot/7303176176.html?orderId=72644423960078) VR headset that comes with a Bluetooth controller.

While button presses are registered on iOS and passed through to Unity, button releases are not. Infect, when I press up, all events are triggered (GetKeyDown, GetKeyUp, GetKey) which should not be de case, and when I release no events are triggered.
My guess is that something is going wrong in the Objective-C code that parses the event to Unity, or my device is not compatible. Am i doing something wrong?

Greetings
FuZZbaLL_b

In Unity

if (Input.GetKeyDown (KeyCode.JoystickButton4)) {
Debug.Log ("Input.GetKeyDown KeyCode.JoystickButton4");
}
if (Input.GetKeyUp (KeyCode.JoystickButton4)) {
Debug.Log ("Input.GetKeyUp KeyCode.JoystickButton4");
}
if (Input.GetKey (KeyCode.JoystickButton4)) {
Debug.Log ("Input.GetKey KeyCode.JoystickButton4");
}

Debug Log

2016-02-23 07:49:08.449 ProductName[509:90021] Button Release!
2016-02-23 07:49:15.183 ProductName[509:90021] Button Press!
Input.GetKeyDown KeyCode.JoystickButton4
Engine:Update()
System.Collections.Generic.ICollection1:Remove(T) System.Collections.Generic.ICollection1:Remove(T)
System.Collections.Generic.ICollection`1:Remove(T)
(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)
(button press triggers everything and release doesn't trigger anything)

UPDATE

I don't think this is an issue with the iCade plugin, but it is probebly my controler that is causing this. The reason i use iCade plugin is because it is the only one i found that gave me a response in unity. I fixed my issue by sending button presses of buttons i don't use, when i release my thumbstick. it's a bit hacky, but it works for my demo.