FRAME_INTERVAL = 0.01 # seconds
display_queue = asyncio.Queue()
async def display(display_queue, stdscr):
    curses.curs_set(0)
    curses.start_color()
    curses.use_default_colors()
    curses.init_pair(1, curses.COLOR_RED, -1)
    curses.init_pair(2, curses.COLOR_GREEN, -1)
    last = time.monotonic()
    while True:
        try:
            item = await display_queue.get()
            while not display_queue.empty():
                item = await display_queue.get()
            now = time.monotonic()
            to_wait = last + FRAME_INTERVAL - now
            if to_wait > 0:
                await asyncio.sleep(to_wait)
            if item is not None:

                    stdscr.clear()
                    stdscr.addstr(0, 0, 'Q')
                    stdscr.refresh()

            last = time.monotonic()
        except Exception as e:
            pass

# initialized in async main:
display_coro = display(display_queue, stdscr)
await asyncio.gather(worker_coro, display_coro)

This is a code which displays a 'Q' character. The problem is that I have only 1 coroutine which sends data to the queue to display but from time to time I can see duplicated output. I can provide more information.
How to resolve it?

Most of frames:

But this appears too:

And even this one: