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Hi,

this was made with CSS, you can remove it with some css code. Please go to WordPress admin -> Appearance -> Theme Options -> General -> Extra CSS Content and add this:

#content h1, #content h2, #content h3, #content h4, #content h5, #content h6, .maincontent h1, .maincontent h2, .maincontent h3, .maincontent h4, .maincontent h5, .maincontent h6, .custom_section h1, .custom_section h2, .custom_section h3, .custom_section h4, .custom_section h5, .custom_section h6, .h1, .h2, .h3, .h4, .h5, .h6 {
text-transform:initial !important;
}