I found this problem in new Rekordbox 5.4
In 5.3 I was able to change the grid of the song that was playing by using the music preparation tab in performance mode. If I got a new music and I noticed that grid that wasn't detected properly by rekordbox I could use this red and white bar icon to set the grid. When trying to do the same in 5.4 the audio jumps. Not the best thing to happen when playing in front of the people.
@Kris > As this may be hardware-specific, I'll ask you to please file an inquiry ticket here and our rekordbox support team will be able to gather some additional information to assist you in resolving this issue.
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First it would seem wise to never do this on a track that is currently playing but that might just be me.
I tried to replicate this on laptop with RB 5.4 but wasn't able to do so.