Why does this mapping move my cursor?

I have a mapping in my .vimrc :

nnoremap <leader>md :write<CR><bar>:silent !open -a 'Marked.app' '%:p'<CR>

When I invoke the map, my cursor in Vim moves to the beginning of the line. This doesn't happen if I run the commands manually. Why does the cursor move and how can I stop it from doing so?

Thanks!

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