I saw this on "Star Trek" once, so I know its possible....
I think you're caught in a temporal anomaly. You fired shells and killed a guy, but you fired those shells... in the future! Yes, you thought it was several days ago, but actually that battle won't take place for another week!
And that M3 kill you got? You killed that guy with the shells you fired next week, too!
The only way I can see to break out of it is to hope that the worm hole closes on its own. I suppose you could try re-routing a particle beam through the sensor array, but that assumes that you have the skills to reconfigure the entire warp core matrix. You do have access to a warp core, right?