shortcodes don't show well

hello, i am trying to apply some shortcode e.g for fancy title. The shortcode is from https://themes.muffingroup.com/be/theme/shortcodes/content-elements/#fancyheading

and i am copying

[fancy_heading title="Praesent dapibus neque id" h1="0" icon="icon-picture" slogan="" style="icon" animate=""]
<p class="big">Morbi in sem quis dui placerat ornare. Pellentesque odio nisi, euismod in, pharetra a, ultricies in, diam.</p>
[button title="Button with icon" icon="icon-heart-fa" icon_position="left" link="#"]
[button title="Button with icon" icon="icon-heart-fa" icon_position="left" link="#" color="theme"]
[/fancy_heading]


and this [fancy_heading title="Praesent dapibus neque id" h1="0" icon="icon-lamp" slogan="Morbi in sem quis dui placerat" style="line" animate=""][/fancy_heading]

but the result is not as shown on your page.

Mine is like this

https://i.imgur.com/ac5zZZN.png

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