Kvantum themes will set but change slightly after closing Kvantum manager

Hello, first of all, sorry if my comment enters a separate topic. So far no problems during this update. But. In an update from October last year, Kvantum crashed and does not apply dark themes correctly. In other posts a solution seems to have been found, but honestly I’m a newbie and I don’t know how to apply them or what happened next. Would it be a good idea to apply them in some next stable update? Thanks!