Duplicating Artists?

I added an album using an Amazon ASIN B000003JAU, Jethro Tull - Original Masters, and now in my Artists listings I have 'Jethro Tull' and 'Jethro Tull '. That latter has a space appended and shows up as artist=Jethro+Tull%0A when accessing the URL, while the correct one displays artist=Jethro+Tull.

I've had the same problem with several authors and artists, except it isn't always obvious is there even is a difference in the names. For instance, I added several custom entires for self-published books by a single author, and they will not aggregate. On my main Books page, it looks like I have only one book by the author, but when I click the "Owned" tab, I clearly see the three.