Hi Jane,
Can you check in Appearance > Customize > Additional CSS if the CSS for Liberte template was imported?
Can you try adding this?:
.sketchy-border, .sketchy-border > .elementor-widget-container, .sketchy-border > .elementor-column-wrap, .sketchy-border > .elementor-widget-container .elementor-button {
border-radius: 255px 15px 225px 15px/15px 225px 15px 255px !important;
}
.sketchy-border-swap > .elementor-widget-container, .sketchy-border-swap > .elementor-column-wrap, .sketchy-border-swap > .elementor-widget-container .elementor-button {
border-radius: 15px 225px 15px 255px/255px 15px 225px 15px !important;
}