They must be political files. Files can already be corrupted at the source (& there's many of them out there) & there's not much u can do about them except try dwnlding from different sources or options in your search results.

Sometimes files can become corrupted during the dwnlding stage. This means there's data missing or similar. This may result from dropped connection along the way, data clashing, etc. At the end of the dwnlding process, LW attempts to redwnld those bits & bytes that are incorrect or missing. If LW didn't have this process, you'd just end up with even moe corrupted files w/o you knowing about it until you attempted to utilise them.