Please check the following points.
1. check if the sync status switch on the Premium Services page in the iPad app is turned on. If not, please turn on the switch and wait until the data is synchronized.
2. check if the data has been uploaded from the iPad.The communication indicator (the spinning icon) appears in the upper right corner of the planner while data is being synced.
3. make sure that you are using the same account that you signed in on your iPad to log in to your iPhone. If the accounts are different, sign out on your iPhone and then sign in with the same account.
4.If you have created multiple planners, make sure you are not viewing a different planner than the one being synced.