audio guestbook using teensy 4.0 rev D and 4.1. Playback messages skipping

[Marty Gem]

Hi l am a complete novice but have followed all instructions on how to build audio guest book. The issue i am having is on the playing back the message. It jumps and I can hear every 2nd or 3rd word. I am not a coder. Do I need to change anything in the program.?
I would be grateful for any guidance.

Regards Martin