### Answer
It seems you're encountering issues with Deepgram voices talking over each other while Elevenlabs voices are functioning correctly. Unfortunately, I don't have specific information or troubleshooting steps for issues related to voice overlap in Deepgram within the provided documentation.
For resolution, it might be helpful to check the configuration settings in your Vapi dashboard, especially looking at the silence timeout settings and response delay settings which can affect when the assistant starts speaking. Adjusting these might help prevent the issue you're experiencing.
If the problem persists, I recommend reviewing the system's setup or contacting Vapi support directly for more tailored assistance.