There could be a few reasons why this is happening. Here are some steps to troubleshoot:
1. Check iCloud Settings: Make sure both of you are signed into iCloud and have Reminders turned on in your iCloud settings.
- Go to "Settings"
- Tap [your name] at the top, then "iCloud"
- Make sure the switch for "Reminders" is in the 'on' (green) position
2. Update Devices: Ensure both devices are updated to the latest version of iOS. Outdated software can sometimes cause syncing issues.
3. Check List Sharing: Make sure the list is properly shared.
- Open the Reminders app
- Go to the shared list, tap the three dots in a circle icon, then "Show List Info"
- Check to see if your husband's Apple ID is listed under shared with. If not, share the list with him again.
4. Check Network: Ensure both devices have a good Wi-Fi or cellular connection, as iCloud sync requires internet.