No. Once you've selected a pre-configured template and made changes to it, you will need to click on the "next" button in the lower right hand corner of step 2 of the campaign in order for the changes to be saved for posterity.
Once clicked, the changes should reflect should you navigate away from the campaign and come back.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)