Remove bullet in tabs

Hello! Thank you so much for making this!
Now my recommended posts look great.

But I have this problem, I don’t know why because of my theme in the title tabs appear some bullet points in the unselected sections.
You can se it here

I can’t figure out what code should I add to remove bullets this only in this widget.

Thank you in advance

https://wordpress.org/plugins/popular-posts-tab-widget-for-jetpack/