So you say the files do not apear in the Limewire library, in black at any rate but people are still trying to download them.
I wish I knew better exactly how the Gnutella network works, but my guess is that somehow the titles remain in the network, possibly though the ultrapeers and or leaves you are connected to, until they go offline. This is a wild guess lol
In the past I have had attempts to upload files I have Never had on my computer, mainly by Bearshare hosts, but have not seen this recently. It happened only a few times, but there was clearly some sort of glitch presumably in the way hosts and files identify themselves on the network.
My guess is that after a day or two the failed attemps will stop. Let us know...