C++: random_device always returning the same value?

I am messing around with the std::random_device and std::mt19937_64 classes with the following piece of code. But for some unknown reasons when I start the program it always throw me the same value.

// Random.h content
#pragma once
#include <random>
#include <cstdint>
#include <cassert>

namespace localrandom
{
    std::random_device randomDevice;
    std::mt19937_64 twisterEngine { randomDevice() };
}

template<typename T, template<typename, typename...> class DISTRIBUTION>
T randomGet(T const& min, T const& max)
{
    assert(max > min);
    DISTRIBUTION<T> distribution(min, max);

    return distribution(localrandom::twisterEngine);
}

template<typename T, template<typename, typename...> class DISTRIBUTION>
void randomFill(T* buffer, uint32_t const count, T const& min, T const&  max)
{
    assert(buffer);
    assert(count);
    assert(max > min);

    DISTRIBUTION<T> distribution(min, max);
    for (uint32_t bufferLocation = 0; bufferLocation < count; ++bufferLocation)
        buffer[bufferLocation] = distribution(localrandom::twisterEngine);
}

According to random_device()'s documentation it might be due to the implementation and as I am developing on Vita using VitaSDK.... That might be the culprit but how can I know for sure ? Am I missing something here ? Is my code wrong ?

EDIT : I use WSL (Debian) as my development environment.