Thumbnail container for mobile

I am trying to figure out how to have more thumbnails on mobile devices.

It is only showing 5 and the 6th one will not show...It is placing the 6th thumbnail on a second line below the others, so using the thumbnail arrows will not reveal the 6th one

exclusivebuildercorp.com/sandbox/index.php/dominica

Hi
by my side I have no problem with the thumbnails
but you can override the thumbs container with CSS if needed
CEd