Hi,

When you have a quiz with multiple total grades and you duplicate it, the quiz is duplicated but the multiple total grades is not properly configured.

This is the multiple total grades configuration of the original quiz: 

This is the multiple total grades configuration of the duplicated quiz: 

 
Same happens with backup and restore

In case it is relevant I am using https://quizgrades.prototype.moodledemo.net/ (I am checking some things for the app side)