I just joined today and found a Seller of Strange Junk on my travels at 12,5 in The Newbie Asteroid Belt [lvl 1-20].

I purchased 1 x Mech Control Chip and 1 x Empty Vial from  him.

When I clicked "Show me my recent purchases" I got a load of stuff appear which I didn't purchase, some of which was before i even signed up today.  I took a screenie for your perusal.

http://www.mynetimages.com/viewimage/cf98b7f283

I'm not sure if the wording is wrong for "show me my recent purchases" and it actually shows all purchases made form this vendor, or if it's a bug showing me other peoples purchases when it shouldn't be.

Thanks

Annie

Could this be the past 10 purchases from this npc? 

Interesting. I wonder if it's showing the last 10 globally, as suggested above. I've never noticed this myself, but perhaps that's because the times I've checked the purchase history are usually after I've been testing purchases, so the log ends up being populated by myself anyway, concealing the bug.

I can confirm I see what she sees also. I've only bought 1 mech chip and 2 vials from him before, and it shows more than that.