If you get things like "Category Archive" on ce...

Go to appearance > editor and on the right select the file “Category Template – category.php” then look for and remove this code:

<h1 class="page-title"><?php
                        printf( __( 'Category Archives: %s', 'mummyblog' ), '<span>' . single_cat_title( '', false ) . '</span>' );
                    ?></h1>