Sometime when I am using the Snap&Read speaker tool or the Co:Writer Talking Word Processor the words are not highlighted correctly and some text is read twice.
When in Pageless Google docs breaks the text up into sections.(You cannot see the sections on the page). The sections also include some text from the bottom of the previous section. Pageless mode does not currently have a way to track the text that is from the previous section of text. So, the text is partially highlighted and read twice.
The workaround/solution is to toggle Pageless mode off.
In Google docs:
Click on File.
Click on Page Setup.
Click on Pages.
Click on OK to set that specific doc to Pages mode.
Click on Set as Default.
Click on OK.