We have found that the main cause of a 'jumping' page while editing in Create is having a mixture of right and left aligned images with text wrapped between them.
There are two ways we've found to correct this issue:
1. Remove the right aligned image or make it a left aligned one instead.
2. Place the image and text in a table with no borders. Use the table rows/columns to align your text the way that you want.
Please refer to the Create Guide section on creating tables for more information.