Hello @perkinspapercraft,
Actually, the thing is in responsive view the header will get cropped and this is how the theme is designed.
However, the whole image can be displayed using the CSS in responsive view but the height of the header image will be decreased.
Use below given CSS to adjust the header image.
@media only screen and (max-width: 767px){
#custom-header {
background-size: contain !important;
}
}
Hope this helps.
Best Regards!!