Shortcode Ultimate Tabs Not Working Perfectly

I created tabs in my website with custom styled “Tabs” shortcode. I also add the following codes in the plugin CSS file:

<style>
.su-tabs.my-custom-tabs { background-color: #84ADEA }
.su-tabs.my-custom-tabs .su-tabs-nav span { font-size: 1.1em }
.su-tabs.my-custom-tabs .su-tabs-nav span.su-tabs-current { background-color: #EDFAFF }
.su-tabs.my-custom-tabs .su-tabs-pane {
padding: .5em;
font-size: 1em;
background-color: #EDFAFF;
}
</style>

But now I see that all my tabs all displayed in one page, and switching tabs doesn’t work.

This is my website: http://bestmattressreviewed.com/ . The problem exists just below the fold.

Can anyone please tell me what’s the problem with my tabs?

https://ww.wp.xz.cn/plugins/shortcodes-ultimate/