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Frets settling in after shipment.

I think some frets have some Finish(Poly?) on them that wears off as you break in the bass. I also believe that string wear will eventually "level" out the finger board over time.
 
Fret sprout is 'sideways', or longer fret length due to (usually) dryer air shrinking the fingerboard. More humidity will swell the fretboard back out, and the frets will seem as they prev were.
A lifting (higher) fret would be due to the tangs or glue not holding. Once that fails, it doesn't correct itself.