If you have deleted an event on your device calendar and it is still appearing in Cupla, it may be that the event was originally created on a different device (such as an old iPhone or Mac), which can create a duplicate calendar within Apple. Try the following:
Tap More.
Tap Calendar Settings.
Tap Calendar Connections.
Scroll to the bottom of the screen. If there are calendars from another device stored in Cupla, they will appear here. Untick these calendars.
Tap Save.
Please allow up to 20 seconds for the changes to take effect.
If you are still having trouble, please message our support team from the Cupla app.