iPad - sound files are not playing right from the start

In my series of games on playlist https://jigzi.org/asset/play/playlist/f5937d48-ce33-11ee-bbb4-27bd733b8179?draft_or_live=live&is_student=false, the sounds that you click on each letter cuts off the beginning of the letter. Eg, ba and ga is cut off, leaving the sound 'a', so the child cannot hear the difference on ipad. I did fix the sound file by adding in a little silent space before the wave starts, but then I I have to go in and replace every instance of the ba and ga sounds in the whole course.
On PC the sound works well. It is only happening on my iPad (ios 16.7 - I cannot update to 17 anymore)

Also, some of the correct feedback sound files sound terrible on iPad. Probably the same issue.