How was that clip captured or downloaded? Is it out of sync when played in a viewer, such as Windows Media Player, MPC or VLC, or only in Videopad?
If the file that the clip was saved to is available, please share it. Chances are that the issue can be fixed.
Upload the file to a free server, such as Google Drive or MS OneDrive, right-click the link and Share or Copy. Copy the result and paste it here or to me in a Private Message via the mail envelope in the top-right corner of this forum. When using Google Drive, right-click the file, then click SHARE | SHARE and change "restricted" to "anyone with link can view.**