Post navigation buttons in mobile are skewed

Sorry for this inconvenience! We'll fix this problem in next update.

This custom css code helps you while release is not ready (add it to the bottom of style.css via menu Appearance -> Editor)

.mobile-menu .post-pagination {
    height: 300px;
}
.mobile-menu .post-pagination  .single-post-nav {
    float: none;
    margin: 30px auto;
    width: 100%;
    min-height: 100px;
}