Hi,

We know about this problem an will try to fix in next theme update. If you don't want wait please share ftp access.

Please check category widget.

1. You need to install child theme, copy content-page.php template from main theme to child, open this file for edit and move this code:

                    <?php
                        if ( comments_open() || get_comments_number() ) {
                        comments_template();
                        }
                    ?>

                    <?php if (get_post_type() == 'post' && !thegem_get_option('blog_hide_realted')) { thegem_related_posts(); } ?>

2. Please give some screenshots with your problem.

Try to add next code custom  css in theme options:

.gallery-icon img {
    max-width: 100%;
    height: auto;
}

Try clear browser cash. I see that images in gallery are responsive now.

I checked widget in android and iphone devices. Widget works without any problems.