You shorted and bought a share at the same time, and the system fell over - I'm going to fix this bug, but in the meantime I'll update your portfolio manually. Should be fixed this afternoon.
Sorry I didn't manage to fix it earlier today, I'm going to resinstate your recent 2085 shares of AZN now and refund your 7 earlier shares - so by the time you check your portfolio it should be correct.
Not quite.. or at least it wasn't - seems like a price feed glitch did the opposite for ezabuck and put him way out in first place with a very impressive short on AZN. Anyway, now corrected and back in 7th place. Thanks for letting me know.