BackSpace not working

[rdanang-dev]

<vue-typed-js
            :strings="['idho Danang Sanyoto;']"
            :type-speed="150"
            :back-speed="20"
            :back-delay="100"
            :show-cursor="false"
            :fade-out="false"
            :loop="true"
          >
<h1 class="text-custom-title text-8xl py-4 -m-2">R<span class="typing"></span></h1>
<vue-typed-js>

the backspace effect not showing, it always fade out when the effect end