BUG: German umlaut marks disappear when editing the settings anew

Hi,

in the plugin’s settings at “text” I type in my German text with the German “umlaut marks”, in this case

ü for ü

Screenshot

Then I save this. When I look now at my page, the umlauts are showing right.

BUT:

when I call the plugin’s settings page anew, then the German umlauts appear in the “text” field again as

ü (and therefor wrong at the frontend)

instead of

ü

Could you please fix it? It is annoying, to type this again and again every time I go to the plugin’s settings page again.
Thanks.

https://www.ads-software.com/extend/plugins/themefuse-maintenance-mode/