You are providing links to TTS documentation which gives a lot of options for TTS engines - which one did you configure (Google, espeak, …)?
From what I read here in the forums Google TTS seems to have problems recently. In case gTTS times out the local Mimic1 voice might be used as a fallback. Maybe that is the scenario that you are observing right now?
Btw: I am running a local TTS engine with this Free german tts voice for mycroft (sneak preview)