Try the following: go to LW's Library (by clicking the Library tab) and click the Shared Folder. There, look for the files that you want to share and see if they are the same as the ones that you have inputed them in the Finder.
You can also try going to LW's preferences and see if uploading is enabled.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-