Spoken Content Voice STUCK

Wondering just where you are choosing the voice that remains on the same voice.

See if this helps:

Change how Spoken Content sounds

1. Go to Settings  > Accessibility > Spoken Content.
2. Adjust any of the following:

• • Voices: Choose a voice and dialect.
  • Speaking Rate: Drag the slider.
  • Pronunciations: Dictate or spell out how you want certain phrases to be spoken.

More info: Hear iPhone speak the screen, selected text, and typing feedback - Apple Support

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Your iPhone uses a compact voice for VoiceOver, Speak Screen, and Speak Selection.

But you have a few other options for the voices you can use for speech.

Apple support's online article: below has info., on downloading enhanced voices

Adjust voice and speed for VoiceOver and Speak Screen on your iPhone, iPad, or iPod touch - Apple Support

Hope this helps you.

All the best :-)