The forces you see on the right side of the report (belonging to the player you attacked on the repository) do not constitute all the defensive forces deployed by the player who occupied the repository, but only those that you were able to kill with your attack group.
If you lose the battle, you are not allowed to see your opponent's total defenses (you can only see the amount of units that you destroyed at the defender), but considering that all your forces were defeated (no survivor!), the defender certainly deployed a vastly larger army than yours (whose victims, because of the clash, are those you see ... and they constitute a minor part of the total!).