Each sentence is repeated

### Describe the bug

<img width="1234" alt="image" src="https://github.com/livekit/agents-playground/assets/165481157/ceb23d8c-31bd-4124-91ea-f3475658e733">


### Reproduction

Each sentence is repeated

### Logs

_No response_

### System Info

```shell
latest version 2024.6.6 clone the repo
```
```


### Severity

blocking all usage of LiveKit

### Additional Information

_No response_