Two "read more" buttons

Hello for some reason on my start page, under the blog exerpt it shows two different “read more” buttons. how can i resolve that?

www.mrschuett.de

Hi, red button is from some shortcode, maybe Supreme Shortcodes, and Continue Reading → is from your post (you inserted read more tag or change settings in Appearance > Customize > Content/Excerpt), just remove one of them.