Problem with Hyphens

Dear all

I have a problem with a new website:

Startseite

I added in the custom CSS the following code for hyphenate the words:
Small Screen (iPhone Landscape) and Extra Small Screen (iPhone Portrait)

body {
-ms-hyphens: auto;
-webkit-hyphens: auto;
hyphens: auto;
}

On the iPhone it works without problems (german an french).
But on other devices (Pixel 3, Samsung 8) the hyphen-code does not work.
Strangely, only in the german version. The french version works also without problems.

Could you help me to solve the problem?
Thanks a lot in advance.

Kind regards
Dario

Ticket