Thank you for providing additional details, although I apologize that you haven't received a follow-up response. First, If you haven't already and open Quicken and go to the Help menu > Report a Problem. There have been ongoing issues with splits details being removed upon syncing. Do you use the mobile or web app at all? If not, can you confirm if the option to sync to the mobile/ web is on? To confirm, please navigate to Edit > Preferences > Mobile & Web, there will be an on-off toggle. Can you also navigate to the One Step Update settings and confirm is sync to the cloud is selected there?
If either of these options is enabled please disable them and see if this resolves the issue. If this does resolve the issue, it's possible that you may need to move forward without syncing to the cloud or mobile app until the issue has been corrected. I hope this helps to clarify. -Quicken Tyka