NINA indicator does repaint?

I recentlly come up on this NINA indicator. Ive run it backtesting on strategy tester and on live on demo. Something strange about it is that its signals very occasionally reappear and disappear to change the first original places of arrow signal appearing. Very unfamiliar to me. Is that actually repainting?

That is indeed repainting. And if you are not familiar with the idea, I suggest you get up to speed soon. There are several good threads on it and some not so good. But ultimately it is on you to learn about. My suggestion is get very familiar with the Fractals indicator. It has a lot of merits, but it does repaint. Repainting does not mean it is useless as some state. It just means you have to recognize and deal with it. Also most of the MTF indicators repaint, but again they are useful if you know how to deal with them.