Why does voice to text change to wrong words

It sounds like you are having issues with predictive text when using dictation with Siri. Take a look at the resource below for some steps to try to resolve this issue.

Use Siri on your iPhone, iPad, or iPod touch

Get help with Siri

1. Make sure that your iOS device has an Internet connection through Wi-Fi or cellular data.
2. On your iOS device, make sure that Siri is turned on under Settings > General > Siri.
3. Restart your iPhone, iPad, or iPod touch.
4. On your iOS device, go to Settings > General > Siri and turn off Siri. Then turn it on again.
5. Make sure that the microphones on your device aren't blocked. For example, if your device has a protective case, remove it.
6. If you're using an iOS device, try to use Siri with a headset. If Siri works, get more help with the microphones on your device.
7. Contact Apple Support.

Get help with the keyboard on your iPhone, iPad, or iPod touch

Turn off predictive text

To turn off predictive text tap or press and hold and tap Predictive.

You can also turn off predictive text in Settings > General > Keyboard > Predictive.

Give those steps a try and let us know if this was helpful.
Enjoy your day!

Yes, this is exactly what happens to me. I think if you watch carefully, what you voice-to-text may appear correctly as you speak. But it may be correct only for the first half of your sentence. As you speak the second half of the sentence it seems to sometimes rewrite the first half of the sentence as if it is re-interpreting the meaning of what you intended to say in the full sentence.

This is AI at its worst. It is too smart for it’s own good. By this I mean it accurately transcribes the words you intend to use, but then changes them according to a meaning that it calculates must’ve been your intention.

I believe this results from the program mis-hearing one of the words you used which causes it to proceed to re-interpret your full meaning based on the wrongly heard word.

In the process of doing this, it actually goes back and rewrites the early part of your sentence to conform to the new interpretation of your meaning.

This is AI based on very poorly formulated rules.

Thanks for trying to help. I have this problem and have tried all the above already.

But this doesn’t address the main issue here:

Both dictation and predictive text are getting WORSE not better with each update.

There is another thread about this which seems to be in the wrong place, so the “me too”s here are not alone!

https://discussions.apple.com/thread/7445742

There are also mentions of this issue outside Apple’s forums too.

It’s important to understand that this issue is NOT a simple “it’s not working now” problem. It’s a more gradual but significant worsening of something that wasn’t broken before. For me iOS 11 (on my SE) has produced a significant jump in predictive errors (random Capital letters appearing in the Middle of sentences) and dictation occasionally turning English into idiotic nonsense (repeated words, an apostrophe messing up eg we’ll done). To the extent that I don’t use dictation at all now.

Is this Apple’s AI that thinks it has a better grasp of what we’re trying to say than we do? Because if so, Houston, we have a problem....