Heading disappears on safari

Hi community,

I experienced a weird bug today. Three headings disappear on safari, but not on chrome. On top, if you click on the heading (using safari) it appears. This bug only appears on Mac books using safari. See screenshot below.

Website: www.Mietshausverkaufen.de

There should be three headings in different background colours:

  • Immobilienverkaufen (green on blue background)
  • neu gedacht (Blue in green)
  • jetzt entdecken (blue on yellow)

Please help, my dev also doesn’t know why this is happening. Any idea?