Is it just with my mobile devices?

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Some weeks ago all of the non-ASCII characters on all of my mobile devices became broken. I mean umlauts, French and German accents, and German specific letters.
Just going through Maddy Bell's Nena stories once again and all of the non-ASCII characters {which are numerous as all of the action takes place outside of USA) are displayed as 2 or 3 unicode characters.
Cheked it so far on google browser on android 3.5, latest versions of Opera and Chrome on android 5-something on the phone and tablet. Latest Safari on freshly updated iPhone 4S. Had not yet bothered enough to turn on my gaming rig to check it on PC versions of browsers.
But same letters are shown correctly when viewing other sites in the same browsers and operating systems...
Am I the only one to have this problem?

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