I added ion-radio within a v-for loop using vue, But problem is that all ion-radio become checked, logically second radio item should be checked. I am having a hard time solving this issue

Ionic Framework Ionic Vue
1

Here is my code:

<ion-radio-group value="20">
  <div class="d-flex custom-radio">
    <div v-for="(questionSet, i) in categoryCards.questionsAmount" :key="i" class="item">
      <ion-radio slot="start" value="{{questionSet}}"></ion-radio>
      <ion-label>{{ questionSet }}</ion-label>
    </div>
  </div>
</ion-radio-group>

the categoryCards object is:
categoryCards: {
categories: [“Bangla”, “English”],
questionsAmount: [10, 20, 25],
}

output ss is:

Screenshot_3

How to solve this issue? thanks in advance.