Mission Completion Error

So I was doing the "Sellout Slayer" mission for Duke and I appear to have run into a little bit of a snag... I have done what the mission has told me to do, yet it has not registered the sale of the weapon I used. Here are the screenshots I took.

https://docs.google.com/document/d/11GgEFANQKpvPFi081rcTONcFM0gRI4cQzbpHufB9tQU/edit

I don't know if I did something wrong or whatever, but I just thought it was odd.

what gun did you buy, and how many of that gun do you have?

I had bought a Lorcin 380 and that was the only one I had at the time.

and you used that weapon for all of the attacks, yes?

Yes, I did for the first few attacks until I hit with it, then I switched to my melee weapon

Do you have more now ?

No, I do not