The reason is most likely that you are using the same Grosh account on two devices with different operating system (iOS / Android) users. See Is the Grosh premium subscription tied to a Grosh account?

When you share the list with your spouse, so he or she gets an invite code that can be enter when creating a separate Grosh account in the app at startup (log in and select have an invitation).

If your spouse logs in with your Grosh account on his/her own phone with another Android or iOS account, the operating system will report back that there is no Premium subscription in the operating system (Android or iOS) and hence the Grosh account is downgraded to the regular free version as part of the login process.

On the Premium page, you can now also remove the detected in app purchase from within the app. From Settings, tap the image at the op of the screen. This shows you the Premium screen and from there you can remove the detected in-app purchase. 

Note, this does nothing on Apple or Google’s servers where the purchase is registered. This is merely to allow you retry a Restore of the purchase.

After the removal, restart the app and it should be running in non-premium mode. The menu shows “Upgrade to Premium” as for any standard mode user.

Head into the Premium screen via the menu button and tap Restore.

If you still have problems, see How to send app log file to support

All users have access to log screen that can be used when reporting bugs. Here’s how to use it:

• Tap Menu-Settings-Functions and scroll to the bottom.
• Toggle on “Support logging”
• Perform the action in the app that causes problems, then press the image at the top of the menu to access the log screen.
• Then tap the Clipboard icon bottom right to copy the log to the clipboard.
• Then open your mail program and send us a mail briefly describing the issue and at the end paste in the log contents at the bottom.

PS App logging will have a performance impact, so switch it off after the trouble shooting is done.

This is done in order to keep the grocery vocabulary tidy, as explained here: Why can I not add a grocery name?

For a wish list, you can set the expiration (due date) for the list. This is intended to be the planned date for the event, e.g. a persons birthday or date of a party someone is arranging. Only the list creator can set the expiration / due date.
Once the expiration date has been reached, the list creator (admin) will be prompted if items on the list should be deleted, marked as bought, or a new due date should set.

Note: If you reuse the wish list for a new event that is within 6 months of the old event, you will se items marked as purchased on the list. If you arrange frequent events, you need to create a list per event to avoid this. The reason why this happens is because the list keeps showing bought items going 6 months back in order not to reveal what has been bought or not.