Hi Khürt. When I still had sharing buttons underneath my posts, I had the same issue: they all appeared underneath my webmentions on other sites. It’s primarily an issue of how the receiving site then loads and stores your post that contains the mention. (I had one site that took my entire page, including sidebars and site footer.) But I ended up assuming it was because my sharing buttons ended up within an h-entry microformat. In the end I removed all my sharing buttons, as I realised I didn’t feel they added much utility.
(I edited your webmention earlier to remove those buttons, but when you edit the posting it gets re-send)