Forum:"Those!" Help. I Think I Messed It Up Somehow

Well I did everything as normal and what not. Went down to the station, talked to the scientist guy and stuff. I went into the Queen's hatchery and killed the Queen Ant along with FOUR OUT OF FIVE Guardian Ants. I left and later came back to kill the fifth, but it's still telling me I haven't killed all Five yet, and I've counted, there are in fact five of those ants down there that I've killed. Please help!