Thumbnails are not displaying correctly

Dear forum,
after a few years' break, I am currently updating my old panoramas/tours. So far, so good, but I have discovered a problem that I simply cannot solve. It's probably a minor issue if you know where to look. My thumbnails display correctly in the desktop version, but they are hidden in the iPhone version – why? :o(

Can anyone help me? That would be great.
Many thanks in advance!

You can find the panoramas and tours here: https://swissfolio.ch/rundgang/hotelutokulm/


And I'm attaching two screenshots from my mobile phone here.

Hey Forum,

I was able to fix this:

<layer name="skin_thumbs" state="closed" url="%SWFPATH%/plugins/scrollarea.swf" alturl="%SWFPATH%/plugins/scrollarea.js" direction="h" align="lefttop" width="100%" height="100" zorder="1" onloaded="skin_updatescroll();" onscroll="skin_updatethumbscroll();" />

Now I still have the problem that the scroll bar on my iPhone/mobile phone doesn't stop at the last thumbnail. Maybe someone here has some advice ;o)

Many thanks in advance, Werner