EDIT, i see what you mean now, it’s keeping that class in the body element for somereason 
EDIT2 : i made a copy of the theme with no components, same issue persists, so it must be in a plugin or core.
Jankiest solution award goes to me 
<script type="text/discourse-plugin" version="0.8.19">
api.onPageChange((url) => {
if (url.indexOf("/c/documentation/") >= 0) {
$( "<style id='documentationworkaround'>.topic-list .topic-list-body .posters,.topic-list .topic-list-body .posts,.topic-list .topic-list-body .views,.topic-list .topic-list-header .posters,.topic-list .topic-list-header .posts,.topic-list .topic-list-header .views{display:none!important}.topic-list .topic-list-body .main-link,.topic-list .topic-list-header .topic-list-data{width:90%!important}.full-width .contents .topic-list .topic-list-body .activity,.topic-list .topic-list-header .activity{width:10%!important}.topic-list .topic-excerpt{display:none!important}</style>" ).appendTo( "head" )
} else {
$( "#documentationworkaround").remove();
}
});
</script>
But yeah if anyone knows what’s causing it please let me know 