Captivate 2019 Audio attached to objects cuts off to early

I am using Adobe 2019 on a Mac Book Pro. I am creating a scorm package and on one slide I have three objects that are activated by clicking a button for each. Each object has a narration .wav file attached. In preview these all work fine. The audio plays on activation all the way through. However, when I replay the scorm package on my LMS ready for publishing two of the three sound file cut off before they have finished?? I have read about adding "dirty sound" to the end but that has not worked for me and is not really an answer the sound files were originally recorded in a sound studio and sound very proffessional me trying to mess about with the sounds is not a good result. I beleive that this issue was raised as far back as Captivate 6 so does anyone have a workable solution. I have checked the fade in fade out they are both set to 0 so this is not the cause. PLEASE PLEASE HELP captivate is so frustrating when things dont go right.....