Is Limit Value 10? Does the game_texts have All Players checked? Replace the old map in the map vault with the one you have now.
BTW, I just noticed I had two game_counters in my example map. One of them, the one without a name, is useless.
EDIT: I got your map working. I'll upload in a minute.
EDIT:
Here it is.
I used a game_counter, and I also changed some other things.
The game_texts triggered when you have killed all the headcrabs didn't have All players checked (you need to have it checked when it's not the player triggering the game_text), I removed the weapon_crowbar game_player_equip and put weapon_crowbar 1 into the game_player_equip with item_suit (no need to have two different entities).
I also had to somehow make the player trigger objective2_gun. I solved that using a game_zone_player, but there may be a better way.
By the way, why does the wooden crate have glass as material type?