There are many magnet links from one file. why?

[bachlx-bitmark]

Hi.
I checking the downloading file between webtorrent and other client and I received many different magnet links.

File to check:
https://drive.google.com/file/d/0B59_PYQdzzG6TXppLUZfZzV1a2M/view?usp=sharing

I used utorrent on window, webtorrent on linux (run via node on terminal)

Case 1. Download from utorrent to webtorrent
I create torrent file and get magnet link from file:
magnet:?xt=urn:btih:0750D504A7A76C5A8DD688E39C0BA547175DD5D7&dn=test.txt
I used this magnet link to download by `webtorrent`. It is OK, file is downloaded.

Case 2.  Download from webtorrent to utorrent
I create torrent file and get magnet link from file:
magnet:?xt=urn:btih:0154fafa408d0590df02ce4f132e193f38e7613a&dn=test.txt
I used this magnet link to download by utorrent. It is OK, file is downloaded.

The downloadings of two cases are OK, but I see that magnet links of two cases are different.
webtorrent : magnet:?xt=urn:btih:0154fafa408d0590df02ce4f132e193f38e7613a&dn=test.txt
utorrent : magnet:?xt=urn:btih:0750D504A7A76C5A8DD688E39C0BA547175DD5D7&dn=test.txt

I used webtorrent-desktop and create magnet link from this file, but I received other magnet link:
magnet:?xt=urn:btih:2414f135d51fced62d538f3d763bbc7f05df3808&dn=test.txt

I using:

• WebTorrent version: 0.97.1
• Node.js version: 6.5

[feross]

There are a few things that go into calculating the info hash, including the torrent name. You're probably using a different name in each program.

[lock]

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