Yes, I was intending to compare both factors. Specifically, Table 13 of the report (p. 28) lists rates of violations resulting in a jail stay as a proportion of the population of each demographic on probation/parole, whereas Table 14 (p. 30) lists rates of violations resulting in a jail stay as a proportion of the total population of each demographic. 

My main beef with this article is that it seems to suggest that black adults are jailed at a disproportionately high rate because black adults violate probation/parole (resulting in jail stays) at a disproportionately high rate (i.e., data that would be found in Table 13, which fails to show such a lopsided disproportionality), but instead relates the data from Table 14, which seem irrelevant without also taking into account the proportions of each population on probation/parole in the first place.