Why does the Instagramm app repost VKontakte with some other people?

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Hello cheaters!
In general, the situation is this, you need to repost from instagrama, on iOS (tablet, phone - it doesn’t matter), on the VKontakte wall.
What I do:
- open instagram / look for a photo / click share
- a thumbnail is displayed, next to a text field, at the bottom of the VKontakte button, Facebook, etc.
- in the text field I write @ my instagram profile
- I click share
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My photo is displayed on the VKontakte wall and at the bottom where the link to my instagram should go, a link to another VKontakte profile