You can try the following:
- pressing delete key at the end of the text at page 126
- Check if you have the option to 'Unlock Pages' in 'Production' Menu.
If you still face this issue, then can you please save that document to disk (File > Save To Disk) and mail us at DL-AdobeStory-support<at>adobe<dot>com, so that we can suggest a fix?