You might be trying to download fakes, there are lots around. Stay away from files with huge numbers of sources (up to 100), go for a file with 10 sources or less. If you're searching for new releases, you're more likely to see fake files than if you search for older movies.

Always look up a file with Bitzi before download. Bitzi lets users rate files & so, if a file's been rated, you'll get an idea of content & quality
How to use Bitzi