Timeline extension issues

Hello,

I am finding an issue once I have built slides in my projects with the correct timelines, aligning usually with audio narration, when I go back into the project later the timelines have automatcially extended and I need to adjust them. These are happening on random slide and usually multiple layer slides. It's quite time consuming to check every slide and every layer, each time to ensure the timelines aren't doing this. This usually occurs after I have published to Review or Scrom.

Any assitance would be apprecaited.