Hello,
1- The comma that appears after the name of the person its not bug, its theme default format style. But you remove it if you want to.
To remove the coma, please go to file vc_templates\testimonial_carousel.php and find this line:
$output .= '<h6>'.esc_html(get_the_title()).', </h6><span class="position"> '.esc_attr($cl_redata['staff_position']).'</span>';
and replace with this:
$output .= '<h6>'.esc_html(get_the_title()).' </h6><span class="position"> '.esc_attr($cl_redata['staff_position']).'</span>';
2- Can you send us a link where you are experiencing this?
Try this code instead:

@media (max-width:767px){
.testimonial_carousel .item .param h6 { width: 70% !important; text-align: center; margin-left: 10%; }
}

— Skills and Chart Skills element
To change the animation speed on mobile for Skills element add these lines to your custon CSS box:

@media (max-width: 480px){
.skill>* 
{
  transition-duration: 0.1s !important;
  -webkit-transition-duration: 0.1s !important;
  -moz-transition-duration: 0.1s !important;
  -ms-transition-duration: 0.1s !important;
  -o-transition-duration: 0.1s !important;
}
}

You can change the value (in seconds) as you wish .
–Contact us page
The list element on contact page shows up in the correct way on every demo, maybe you have an issue in your site. I don’t understand very well what issue are you having, please send us your page url or a screenshot.
Let us know.
Best regards!

Hello,

Can you please send us your wp credentials in a private reply? So we can test and fix this. Let us know.

Best regards!

Hello,

1-I see you have edited the code we gave you to this:

@media (max-width: 480px){
.skill 
{
  visibility: visible ;
  -webkit-animation: none ;
     -moz-animation: none ;
       -o-animation: none ;
      -ms-animation: none ;
          animation: none ;
}
}

Which removes at all the animation.

3-I added this code into the page’s custom css box:

.wpb_content_element.list.only_icon {
    width: 100%;
}

It’s ok now.

Best regards!