I think every theme i install overlaps twenty twenty theme, idk if that sounds about right or am i just a complete dumb fuck...Have you tried to install the theme on a fresh WordPress, or on a old one? Also, if you install a new theme ( and there is existing demo already imported ), don't import the new demo data. Pm me if you want to take a look there.
Cheers!
maybe you need to watch a yt video guide .
theme and plugin not the same but clash sometimes .
learn the basics first .
divi can do everthink , and has templates .