Exploded View becomes un-exploded

I exchanged some parts with different parts. I then activated the exploded configuration to position the parts where I wanted them.

After doing UPDATE_LAYOUT on the layout view, the explosion collapsed, so none of the parts were exploded anymore.

I know that I can just go back into Annotation Module and re-create the view, but I would like to avoid that step.

This happens only occasionally and I haven't figured out what triggers it.

Any idea what's going on?

Using:

Creo Elements Direct Modeling 18.1

Creo Elements Direct Drafting 18.1

Thanks,

Mike