... and you went to the Itch app and saw a ready to use zip file of your game there, ready for the taking? *
The caching of the Itch app shows up as a download. Every browser caches your web game. It is some of those quirks where no one knows the purpose of. There is a thread every other week about someone wondering why their html game has "downloads".
* I actually do not know. But I do know that the caching shows up as a "download". And I also know that incomplete downloads are also counted as downloads.