surround vim + rails vim : ERB tags are added on the separate line

I use those 2 plugins so I wanna use them so I tried to put ERB tags on the line - so I visually select line do S = just as is suggested here https://stackoverflow.com/questions/4275209/how-do-i-insert-erb-tags-with-vim
but it put ERB tags <%= %> on the sperarate line? did anyone have this problem

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