Duplicate voice input

When I speak into the microphone and press the right Alt key again to transcribe the text into the input box, a lot of duplicate text appears

For example, the expected input should be: This is a normal text input

But the actual text in the input box looks like this:

This is a normal text input, This is a normal text input, This is a normal text input, This is a normal text input, This is a normal text input, This is a normal text input This is a normal text input, This is a normal text input, This is a normal text input, This is a normal text input, This is a normal text input