Video does not show on mobile

Hi
there are 4 slides on my homepage, number 4 is a video.
On mobile there are 4 dots, indicating that there are 4 slides but after slide number 3 there is nothing….not even an empty area. it is as if there is no slider at all.
(Yes, i checked the responsive settings)
URL in privtae field
kind regards
chris

PS: This is the code for the smallest screensize:

[av_slideshow_full size='no scaling' min_height='0px' stretch='image_no_stretch' control_layout='av-control-default' src='' attachment='' attachment_size='' position='top left' repeat='no-repeat' attach='scroll' conditional_play='' animation='slide' transition_speed='' autoplay='false' interval='7' lazy_loading='enabled' av-desktop-hide='aviaTBav-desktop-hide' av-medium-hide='aviaTBav-medium-hide' av-small-hide='aviaTBav-small-hide' id='startseite' custom_class='startslide' template_class='' av_uid='av-qhwx7' sc_version='1.0']
[av_slide_full slide_type='image' id='862' video='http://' mobile_image='' fallback_link='http://' title='' video_format='' video_ratio='16:9' caption_pos='caption_right caption_right_framed caption_framed' custom_title_size='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' custom_content_size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' custom_title='' custom_content='' heading_tag='' heading_class='' link_apply='' link='lightbox' link_target='' button_label='Click me' button_color='light' link1='manually,http://' link_target1='' button_label2='Click me' button_color2='light' link2='manually,http://' link_target2='' overlay_opacity='0.5' overlay_color='' overlay_pattern='' overlay_custom_pattern='' av_uid='av-jq7rv' sc_version='1.0' video_autoplay='' video_controls='' video_mute='' video_loop='' overlay_enable='']

[/av_slide_full]
[av_slide_full slide_type='image' id='863' video='http://' mobile_image='' fallback_link='http://' title='Unsere Arbeits-Welt ...' video_format='' video_ratio='16:9' caption_pos='caption_center caption_center_framed caption_framed' custom_title_size='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' custom_content_size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' custom_title='' custom_content='' heading_tag='' heading_class='' link_apply='' link='lightbox' link_target='' button_label='Click me' button_color='light' link1='manually,http://' link_target1='' button_label2='Click me' button_color2='light' link2='manually,http://' link_target2='' overlay_opacity='0.5' overlay_color='' overlay_pattern='' overlay_custom_pattern='' av_uid='av-eg0jv' sc_version='1.0' video_autoplay='' video_controls='' video_mute='' video_loop='' overlay_enable='']

[/av_slide_full]
[av_slide_full slide_type='image' id='861' video='http://' mobile_image='' fallback_link='http://' title='Jetzt gilt es...' video_format='' video_ratio='16:9' caption_pos='caption_center caption_center_framed caption_framed' custom_title_size='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' custom_content_size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' custom_title='' custom_content='' heading_tag='' heading_class='' link_apply='' link='lightbox' link_target='' button_label='Click me' button_color='light' link1='manually,http://' link_target1='' button_label2='Click me' button_color2='light' link2='manually,http://' link_target2='' overlay_opacity='0.5' overlay_color='' overlay_pattern='' overlay_custom_pattern='' av_uid='av-6zinn' sc_version='1.0' video_autoplay='' video_controls='' video_mute='' video_loop='' overlay_enable='']

[/av_slide_full]
[av_slide_full slide_type='video' id='' video='https://vimeo.com/manage/videos/543650228' mobile_image='' fallback_link='https://' title='' video_format='full' video_ratio='16:9' caption_pos='caption_bottom' custom_title_size='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' custom_content_size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' custom_title='' custom_content='' heading_tag='' heading_class='' link_apply='' link='lightbox' link_target='' button_label='Click me' button_color='light' link1='manually,http://' link_target1='' button_label2='Click me' button_color2='light' link2='manually,http://' link_target2='' overlay_opacity='0.5' overlay_color='' overlay_pattern='' overlay_custom_pattern='' av_uid='av-kobphekn' sc_version='1.0'][/av_slide_full]
[/av_slideshow_full]