Almost definitely a bogus drive. I bought one from Hong Kong from a seller with good(ish) feedback and found that a 32GB drive turned out to be actually less than 4GB - loads of corrupt sectors etc.
I even left good feedback myself - I loaded it up with over 30GB worth of data and tested a couple of files - all looked ok so I left good feedback. I later tested the drive using a program called h2testw_1.4 and found that only about 4GB was uncorrupted.
Of course, you'd have to buy the drive to test it but I'd have to say, if you pay around £20 for one of these drives, it's going to be a duffer.
Don't do it.
Incidentally, I filed a Paypal dispute and managed to negotiate a £12 refund (I only paid £18), so I was pretty happy but then I think they figure the amount of refunds they give vs. the amount they sell.