Dashes/ Lines on website

the “lines” are likely related to this bit of CSS in your theme.
try changing to content: none;

h1:not(.site-title):before,
h2:before {
  background: #767676;
  content: "\020"; 
  display: block;
  height: 2px;
  margin: 1rem 0;
  width: 1em;
}