Thank you for the reply. Interestingly, I thought the cause of this reloading is because of non-downloadable notebooks, and I subscribed to premium only attempting to fix this by enabling the offline mode (although failed xd). From my limited knowledge, I guess the cause could be some synchronization implementation, which Apple's Notes does very well. I hope Evernote tech team can see this and make some improvement. This sabotages the user experience a lot especially for cases like this,
Evernote is well known for its simplicity and easy to use, but if this problem on IOS persists, it is actually better to just use Apple's most basic Notes app.