Double when display site name & tagline in title tag.

Hello
Thank you for a wonderful theme.
However, there is a place where I want you to fix one.
It is displayed on the double when displaying site name & tagline in title tag.(example: wordpress | sitetaglinewordpress | sitetagline)
(Rather than your site) where it was again confirmed in the theme preview, it has repeatedly become still.
It will be saved to be repeated us to suppress.
NOTE: This sentence we use google translation.