Contacts notes function not always saving and/or syncing between devices

I write notes into the contact for the person I am meeting either on my ipad or my iphone. Sometimes new notes do not save. Sometimes they do save on the originating device but sometimes they do not sync to my other device. I have syncing turned to on position on both devices. I have lots of icloud storage. I have ios 17.6 on both devices. What should I do to insure notes are saved and notes are synced between devices?