That has nothing to do with your dataset. It is just creating 609 (0.03*20322) random numbers.
What are you looking to do?
a01 215 75
2 aaronha01 180 72
3 aaronto01 190 75
4 aasedo01 190 75
5 abadan01 184 73
6 abadfe01 235 74
By the way, we can't read your csv file. Create a reprex instead, or even a sample dataset e.g.
data.frame(player_id = letters[1:6],
height = runif(6, 170, 220),
weight = runif(6, 70, 80))