1. Is "Golf clubs" a connect iq app, or is it something else?
2. If It is an app, did you initially try to install it from the "Connect IQ" mobile app, or Express?
If Golf clubs is not a Connect IQ app and was not installed from the Connect IQ Mobile app, you would need to make a post in the Express forum which can be found here https://forums.garmin.com/apps-software/
Former Member Devices do have a CIQ app limit. Some devices it is 16 and some it is 32. Even if there is empty space on the device it will not allow more than this number. Can you confirm that you are not hitting this limit?