I had a touch screen issue with my Echo Show 8 Gen 3 where when you scroll it would say a letter instead of scrolling. A single letter with each scroll attempt, sometimes choosing an option of you don’t scroll the right way. Then I realized it was spelling the title on each line one letter at a time with each swipe! In order to reach the 8th of around 15 lines had to painfully listen to it spell each and every letter of each line to reach the accessibility option in setup then turn off the option for VoiceOver intended for those with limited sight. How this was set on I have no idea. Maybe a factory reset would be easier but maybe still the default.

Have you tried resetting it by holding down the power button for 15 seconds? Or taking the battery out and putting it back in?