Earlier quoted context omitted.
Are you implying that it would be good if the ones sent were based on a gender balance rather than being chosen on their math ability?
Intentionally uncharitable interpretation. More likely that the other teams (and the systems backing them) privileged guys, instead of educating and choosing on math ability.
In 2013, it was Finland and Costa Rica whose teams were "gender balanced", not Ukraine and Bosnia&Herzegovina. In 2012, Bolivia. In 2009, Kuwait.
Previous years stats don't suggest their education systems are anyhow different, it's just how this year's random has laid out.