Update:
Looks like "White Company" finally went the way of the dodo and is gone!

I synched this morning and checked my account, and it's also gone from My Orders and My Collections.
So, what happened

? I think it was some synching glitch in the Amazon server, and after a few days the server finally erased the books from my account (and K3). Still, from now on I'll be sure to NOT mark anything as owned in those darn suggestions lists.