Reply To: Header photo's

For the slider it works, but my header photo’s on my other pages it does not work.

Check this pahe on your mobile and you see what I mean.

http://s25.hetbrielsesinterklaashuis.nl/wp-admin/customize.php?return=%2Fwp-admin%2F&changeset_uuid=54b92cb5-1cf0-4407-bb67-cc87d43f3ecc

On a desktop the picture is fine, but on a mobile it doesnt scale like the slider.