These “studies” are often questionable. Another source lists eight African countries with higher rates than Brazil.
https://en.wikipedia.org/wiki/List_of_countries_by_intentional_homicide_rate
I think much depends on reporting and definitions.
Rates for third-world countries are generally questionable, because the depend on accurate reporting mechanisms. Or even HAVING a reporting infrastructure. In Columbia, Brazil, and most of Africa, how many people just disappear?