Problems with SDL rendering frames - c++

Question

I'm still a somewhat beginner in SDL, and I've come accross a problem that I am little lost on. I've been loosely following LazyFoo's tutorials along with some other additional resources.
The problem is trying to create an animated sprite onto a window.
I managed to isolate the malfunctioning code to whenever I press a key down.
When I press a key down, a new window opens up in addition to the one previously intialized using the SDL_CreateWindow function.
case SDL_KEYDOWN:
int frame = 0;
//Clear Screen
SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
SDL_RenderClear(renderer);
//Render Current frame
SDL_Rect* currentFrame = &iKey.MegamanRun[frame / 6];
iKey.mmxrender((sx - currentFrame->w) / 2, (sy - currentFrame->h) / 2, currentFrame);
//update screen
SDL_RenderPresent(renderer);
//Next frame
++frame;
I'm using a simple megaman sprite, if that helps you understand some of the names.
Specifically, the
iKey.mmxrender((sx - currentFrame->w) / 2, (sy - currentFrame->h) / 2, currentFrame);
is causing new windows to pop up.
the mmxrender function is in a different class on a different file, sx and sy are the size of the window.
void Megaman::mmxrender(int x, int y, SDL_Rect* clip)
{
Init mkey;
//Set rendering space
SDL_Rect renderQuad = { x, y, iWidth, iHeight };
//Set clip dimensions
if (clip != NULL)
{
renderQuad.w = clip->w;
renderQuad.h = clip->h;
}
//Render to screen
SDL_RenderCopy(mkey.renderer, iTexture, clip, &renderQuad);
}
Not sure how to proceed, any help is appreciated.