Nectcloud generates incorrect "reset password" links

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Nextcloud version (eg, 20.0.5): 27.1.1
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The issue you are facing: my nextcloud instance is running at cloud.reichold.org and apparently everything seems to be working. however, nextcloud generates incorrect “reset password” links. These are …cloud…reichold.org/index.php/lostpassword/reset/… . As you can see the domain contains two dots “cloud…reichold.org/…”. If I manually paste the link into the browser and remove one dot, the link also works. The error did not seem to occur with the first users I created. After a couple of configurations (I don’t remember which ones in detail) the error is now reproducibly present. What could be the reason for this and can someone help me that nextcloud generates the correct links again?

Is this the first time you’ve seen this error? (Y/N): yes