Hi.
Actually, when music is produced it has most likely an even BPM. However depending on the genre, type of music and even if it is electronic music or if it is a life drummer the BPM might fluctuate.
Another reason why BPM might change is the way how the music got digitized. i.e. recorded from Vinyl or converted within different, Pitch changes during recording...
There could be many reasons why the BPM is slightly off.
BPM detection logic may not be 100% accurate as well.
Therefore it comes down to the question. Should rekordbox do some sort of rounding to make it look nicer? I don't think so as people may complain that tracks with 120 BPM might not be in sync.
What I can see it is the other way around. People complaining if they got only 1 decimal shown as tracks might not match.
I got a lot of 80ies music in my collection. For the majority you can't even use the normal way to analyse the music as the BPM may fluctuate significantly.
From my angle showing 2 decimals is not something wrong - it is a feature.