Ticking a reminder as complete doesnt update to all devices

My reminders currently show on both my iPad and iPhone when they are due. When I tick a reminder to show it complete, it will only show as complete on the device I am currently using and doesn't update to all my devices.

In the reminders app, the reminders do show as iCloud reminders. Does anyone know if I can set it up so that regardless of the device I use, marking a reminder as complete will update to all other devices?