It was really hard to tell on the video, but it seems your turntable may not be at the right speed ... I'm only saying that from the brief shots where I was able to see the platter strobes (around the time you also dragged your hand to slow it down).
Can you please take a video showing that a bit more clearly?
If the input signal is fast, rekordbox will play fast. It doesn't really do it on its own.