LoadLibrary and GetProcAddress on C++/CLI DLL - loaded twice

Question

I have a .vcxproj with a C file that does the following:

extern long __stdcall CallCreateTube(long **Data)
{
    char DllPath[256];
    FARPROC pfn;
    long rtn;
    long *pData;

    pData = *Data;

    lstrcpy(DllName, progPath);
    lstrcat(DllName, "XEQ\\tube");
    lstrcat(DllName, ".DLL");

    HANDLE hLib = LoadLibrary(DllPath); // believe me here that DllPath is constructed properly.
    if (!hLib) return -1;

    pfn = GetProcAddress((HMODULE)hLib, "CreateTube");
    if (!pfn) return -1;

    rtn = (pfn) (pData); // this will load tube.dll again!

    if(!FreeLibrary((HMODULE)hLib))
        return -1;
    return rtn;
}

Using Process Explorer, when I do the call to LoadLibrary, "tube.dll" is loaded. When I call the line rtn = (pfn)(pData) above, it loads "tube.dll" again!!

This dll (tube.dll) is a mixed assembly (C++/CLI) compiled with /clr. Is it possible that the second instance of "tube.dll" is loaded in the clr context? If so, how to prevent that? The DLL needs to be loaded once in order to use GetProcAddress, but not loaded again when I call the function!