The participant has successfully completed the test at https://test.mashme.io but when connecting to a room, the audio stream are not played fluidly, they may have missing words, or delays.
Audio streams are broken, not offering continuous uninterrupted quality.
Close all unnecessary applications including any videoconferencing application (Zoom, MS Teams....).
You may also want to try rebooting your PC, to ensure everything gets closed.
If you are using a wireless connection, try using a wired connection to your router.
If you cannot use a wired connection, try to get closer to your wireless access point or use a different wireless network if available, to reduce interference from other sources.