Well, I cannot imagine where the Send-to-Kindle app would get the false information from*
but just to be sure, I believe you can manually set the title/author from the dialog box of the app -- so check what is in there?
I prefer to use email via calibre
especially as I haven't used Windows in quite some time.
* -- Assuming you tried sending the copy of the book that was Saved-to-Disk, because calibre does not update the in-library copy unless you use Embed Metadata/Polish Book, and neither one uses plugboards anyway.