The text is there; it’s white on white and appears to have been set via the customizer. Check the customizer and your theme options.
<style>#body-core {background: #FFFFFF;}#introaction-core h1, #introaction-core h2, #introaction-core h3, #introaction-core h4, #introaction-core h5, #introaction-core h6,#outroaction-core h1, #outroaction-core h2, #outroaction-core h3, #outroaction-core h4, #outroaction-core h5, #outroaction-core h6,#content h1, #content h2, #content h3, #content h4, #content h5, #content h6 {color: #FFFFFF;}body,button,input,select,textarea,.action-teaser {color: #FFFFFF;}#content a {color: #FFFFFF;}#content a:hover {color: #FFFFFF;}#pre-header {background: #1fbec4 !important;border: none !important;}#pre-header .header-links li a {background: none !important;}#pre-header-social li,#pre-header-social li:last-child {border-color: #1fbec4 !important;}#pre-header .header-links .menu-hover > a,#pre-header .header-links > ul > li > a:hover {background: #dddddd !important;}#pre-header .header-links > ul > li a,#pre-header-social li {color: #FFFFFF !important;}#pre-header .header-links .menu-hover > a,#pre-header .menu > li.current-menu-item > a,#pre-header .menu > li.current-menu-ancestor > a,#pre-header .header-links > ul > li > a:hover {color: #1fbcc1 !important;}#pre-header .header-links .sub-menu {background: #1dbaaf !important;}#pre-header .header-links .sub-menu a:hover {background: #FFFFFF !important;}#pre-header .header-links .sub-menu a {color: #FFFFFF !important;}#pre-header .header-links .sub-menu a:hover,#pre-header .header-links .sub-menu .current-menu-item a {color: #FFFFFF !important;}#pre-header .header-links .sub-menu,#pre-header .header-links .sub-menu li {border-color: #FFFFFF !important;}#header-responsive .btn-navbar {background-color: #FFFFFF !important;border-color: #FFFFFF !important;}#header-responsive .btn-navbar:hover {background-color: #FFFFFF !important;border-color: #FFFFFF !important;}#header-responsive .btn-navbar .icon-bar {background-color: #FFFFFF !important;}#header-responsive .btn-navbar:hover .icon-bar {background-color: #FFFFFF !important;}#header-responsive-inner {background: #FFFFFF !important;}#header-responsive li a:hover,#header-responsive li.current_page_item > a {background: #FFFFFF !important;}#header-responsive li a {color: #FFFFFF !important;}#header-responsive li a:hover,#header-responsive li.current_page_item > a,#header-responsive .sub-menu-show > a {color: #FFFFFF !important;}#header-responsive-inner,#header-responsive li a {border-color: #FFFFFF !important;}</style>
You’re using a commercial theme, so please use their official support channel. We feel they are best equipped to support their products.
https://shuttlethemes.com/contact/
Commercial products are not supported in these forums.