Cleared cache in LW?
Are you sure it said "uploaded" or was it downloaded? Upload means you are sharing the file with others. Downloading means you yourself are downloading the file to your computer.

There is a setting in LW that allows you to download an identical file with a different name. ie: Tools -> Options -> Downloads, If the file already exists, download it with a different name.

Normally LW checks the hash of the file (contents of file), if the hash is the same then it will say you've already downloaded it, regardless of the filename. However, filename clashes can also cause a problem ... the system would not let you have two identically named files in same folder. Thus, checking the option I gave should fix that issue. (if that's what the problem is.)