Try reproduce this please Antony, however do 1 thing a little different and see if it still causes an issue.
Instead of making a change from your DOM panel and hitting enter to confirm the change, or clicking somewhere else to confirm the change, whenever you make a change, even if in the middle of the text, to confirm your change, press the TAB key to confirm.
This is the way i work in all panels of Wappler, and to be honest it seems to fix multiple issues with alterations not confirming as expected.