That is one of the beauties of VideoManager.
When you scan your library it puts as title the filename of the video.
This was not retrieved from the video file meta data or anything like that. It is just the original filename.
After your recovery I assume the files lost their full name and have strange or short names.
Now because they still keep their file size and file date, video manager assumes they match the ones it previously recognized.
The titles are stored in the videomanager.mdb file.
You can export the database using File/Export.