The Add new Record button is not adding the correct index

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I have a Question and multiple answers of it. when I update the question like this.

On Edit Page . Question1 , Answer1, Answer2, Answer3.
After Some Change like . Answer1 deleted. Answer2 deleted, Answer3 deleted , Answer4 added. Answer4 added.

The Question should be like this after update.

Question1 , Answer4, Answer5

but its like this.
Question1 , Answer1, Answer2, Answer3, Answer5

the issue is when i click the add new answer plus button the indexs are like this.

answers[2][title] = Answer4,
answers[2][title] = Answer5

kindly suggest any solution