Hi,
can you check the Data Type in the listing:
![Image Text](https://content.screencast.com/users/DavidTK/folders/Jing/media/54491bdb-ca5e-4931-8dcd-27c3bc202eb6/2018-08-22_1221.png)
If you've selected the Container type in the creation of the Page Type it has no fields and layouts
![Image Text](https://content.screencast.com/users/DavidTK/folders/Jing/media/c4479cd6-233a-4e52-a168-5dab20bf3261/2018-08-22_1222.png)
If this is the case best would be to just remove and recreate the page type (if you have not created any pages based on them)