@dicluv
If you've downloaded the torrent from the site and are using that in your client, not the one you created, the most likely explanation is that your client is trying to find the files you want to seed in the wrong directory. Look for the "Save path". If you're using qBittorrent, it's the second to last line on the 'General' tab. This is where the client is expecting the files to be. If this is not where they actually are, you have two choices:
(1) Pause the torrent. Copy or move the files there, maintaining the same directory structure as shown in the torrent. "Force recheck" the torrent. It should now find them. If it reaches 100% it has. Restart the torrent.
or
(2) Change the location the client should be looking. In qBittorrent, pause the torrent. Right-click it, then choose 'Set Location'. Use the dialogue box that opens to change the location to where the files actually are. 'Force recheck' the torrent. Assuming it gets to 100%, restart it.
If you're not using qBittorrent, the locations of where to find stuff will likely be different, but the principle is the same.