Hello Moxxy,
Being able to rotate the screen on your iPad is a great feature, and you've come to a wonderful place for help! You mentioned having already verified that the setting is enabled. To clarify, did you verify the setting as outlined in the article below? If not, try the steps there.
Rotate the screen on your iPad
If that setting is enabled as outlined in that article, the next you'll want to restart the iPad. You can find the steps for restarting in the following article.
Restart iPad
If the issue continues after restarting please let us know if this is happening in Apple applications such as Safari and the Camera, third-party applications, or both.
We look forward to your response!