App notifications won’t clear

[JacksonL]

On IOS, the notification bubble on my app shows a notification, despite there being nothing in my message centre and no todo lists.
What could it be? How can I get rid of it?

 

[Administrator]

Clear app cache, totally close the app from phone backend.

 

[JacksonL]

Clear app cache, totally close the app from phone backend.

Thanks for your reply.
I have logged out of the app, force closed it, then when I open it back up and log back in the notification is still there