Why can the encoding get corrupted when sharing in VK?

Question

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Firework! There is a bug that I can't beat: some users are losing their encoding when they share content from the site. It turns out like this:
The keyword is "for some", because the rest are all ok.
Finding out the version of the browser / OS was not successful - I did not find patterns.
More examples can be found by the #artchallenge hash tag on VK.
My code:

url = "http://vk.com/share.php?url=http://artchallenge.me/?utm_source=vk-win&title="+i18n.t("shares.title",{lng: window.lang})+" %23ArtChallenge&description="+i18n.t("shares.description",{lng: window.lang})+"&image=http://artchallenge.me/pics/badges/winner-badge-"+window.lang+"-shareVK.png&noparse=true"

As a result, the user has such a url, by which he goes:

https://vk.com/share.php?url=http://artchallenge.me/?utm_source=vk-win&title=Господа,%20я%20отлично%20разбираюсь%20в%20искусстве!%20%23ArtChallenge&description=Попробуйте%20отгадать%2010%20художников%20подряд%20и%20посоревноваться%20со%20мной!&image=http://artchallenge.me/pics/badges/winner-badge-ru-shareVK.png&noparse=true

&noparse=true at the end does not affect the bug in any way, it used to be without it, but there was a bug, then in support I was advised to add it, but this did not change the situation.
Has anyone experienced something similar?