The reason that the dates in your set date fields render in US format after you attempt to make further edits is due to a Bug in our software. We have brought the matter to the attention of our Development team at high priority and hope to have a resolution soon.

In the meantime, please be advised that the date will always render properly as UK/EU format on the preview and live version of your form. The only place where the date appears incorrectly is when you attempt to edit the form after having already set a date field on the form originally.