Webfont showing weird Ä (Provicali)? : webdev

Hi, I’m using “Provicali” for a Website and only the letter Ä (German) is not showing correctly in the Browser (Mobile on iOS is working fine). Other chars are no problem. I know that the letter Ä is working for this Font.

Letter Ä is messed up

Code:

@font-face {
  font-family: "Provicali";
  src: url("../fonts/provicali/Provicali.eot") format("embedded-opentype"); /* IE9 Compat Modes */
  src: url("../fonts/provicali/Provicali.eot?#iefix") format("embedded-opentype"), /* IE6-IE8 */
url("../fonts/provicali/Provicali.otf") format("opentype"), /* Open Type Font */
url("../fonts/provicali/Provicali.svg") format("svg"), /* Legacy iOS */
url("../fonts/provicali/Provicali.ttf") format("truetype"), /* Safari, Android, iOS */
url("../fonts/provicali/Provicali.woff") format("woff"), /* Modern Browsers */
url("../fonts/provicali/Provicali.woff2") format("woff2"); /* Modern Browsers */
  font-weight: normal;
  font-style: normal;
  font-display: swap
}