Why after reconciling checking account, does Quicken duplicate reconciled items and/or delete them?

nostrumr

Recent issue for me. I getting caught up with reconciling a few months of banking statements. I do not have syncing for this specific account with the bank. I will reconcile the account, sync to cloud and be done. Next time I go to reconcile the next month, the previous balance shows a different amount than it should. Further digging, I have both duplicated transactions in the previous month or two along with some items missing that were there for me to reconcile. The only common trait is the items are things I have bill reminders set up for but none of them are paid via Quicken bill pay.

UKR

Are you Syncing to Mobile/Web?
AND do you use the Mobile app on your smartphone or the Quicken on the Web feature?

If you answer "no" to both, turn Sync off completely. You don't need it.

If yes, try to Reset Sync so that the current cloud sync file is replaced with a fresh complete copy
Do note that a full Sync process may take many minutes to complete.

Log out of your mobile app, then do this on your desktop / laptop:

How to reset Sync to Cloud

1. Go to Edit / Preferences / Quicken ID, Sync & Alerts
2. Under the "Mobile and Web" group to the right, if present, click the "Reset your cloud data" link and follow the instructions until it is complete.

How to turn off Sync to Cloud for the current data file

1. Go to Edit / Preferences / Quicken ID, Sync & Alerts
2. Click the "Sign in as a different user" link immediately above the "Mobile and Web" group.
3. Sign out, then sign back in to your Quicken account using your current (correct) Quicken ID.
4. If the current data file was actively synced to mobile prior to signing out,  the following screen will present a "Use mobile" / "Don't use mobile" choice. Make sure you select the "Don't use mobile" option and move through the remainder of the process. 
   [Please note: The mobile sync option is the default here.]

Also see https://www.quicken.com/support/troubleshooting-quicken-mobile-companion-app
and https://community.quicken.com/discussion/7856172/faq-common-mobile-web-sync-errors-and-solutions#latest

UKR

Are you Syncing to Mobile/Web?
AND do you use the Mobile app on your smartphone or the Quicken on the Web feature?

If you answer "no" to both, turn Sync off completely. You don't need it.

If yes, try to Reset Sync so that the current cloud sync file is replaced with a fresh complete copy
Do note that a full Sync process may take many minutes to complete.

Log out of your mobile app, then do this on your desktop / laptop:

How to reset Sync to Cloud

1. Go to Edit / Preferences / Quicken ID, Sync & Alerts
2. Under the "Mobile and Web" group to the right, if present, click the "Reset your cloud data" link and follow the instructions until it is complete.

How to turn off Sync to Cloud for the current data file

1. Go to Edit / Preferences / Quicken ID, Sync & Alerts
2. Click the "Sign in as a different user" link immediately above the "Mobile and Web" group.
3. Sign out, then sign back in to your Quicken account using your current (correct) Quicken ID.
4. If the current data file was actively synced to mobile prior to signing out,  the following screen will present a "Use mobile" / "Don't use mobile" choice. Make sure you select the "Don't use mobile" option and move through the remainder of the process. 
   [Please note: The mobile sync option is the default here.]

Also see https://www.quicken.com/support/troubleshooting-quicken-mobile-companion-app
and https://community.quicken.com/discussion/7856172/faq-common-mobile-web-sync-errors-and-solutions#latest