Credit Cards change on their own days after reconcile and balance is made. How is this possible?

Thank you for checking out the Community space, muenstermann.

I'm here to share some information about how the balances changed.

QuickBooks depends on the information shared by your bank when updating the account balance. There might be new transactions that are not yet on your record. The good thing is, you're able to reconcile your account before its balance updates. I'll suggest checking the Audit Log if there were entries added. 

Here's how:

1. Go to the Settings ⚙.

2. Click the Audit log under Tools.

3. Locate if there are recent transactions after reconcile.

4. Click View under the HISTORY column.

Also, you can contact our support team for further help. They'll be able to check your account in a safe session.

You can also refer to this article to fix issues at the end of reconciliation in QBO. This contains helpful tips in balancing your account.

Don't hesitate to leave a comment if you have further questions about your account. We're always here to back you up. Have a good day!

Unfortunately, that does not help. There were no changes in the system after I reconciled. The registry had not had any transactions added and the banks had not updated, nor had their amount on the credit card visible on QBO changed. Somehow, the registry did some unusual correction over time (2 days) that was not recorded. 

I know on  my spreadsheets that I downloaded they were all balanced after I reconciled. I am hopeful I won't have to go through 4 years of QBO and verify each individual transaction with the CC companies records. 

Thanks for following up with the Community, muenstermann.
 

Since no changes were made in your books, but the account's balance is changing on its own, I'd recommend checking your browser. It's possible this could have something to do with temporary internet files. Browsing applications store these types of records, but sometimes they can cause problems with certain webpages. You can open a private window and check its balance to see if it's accurate.
 

Here's how to access incognito mode in some of the most commonly used browsers:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P
• Internet Explorer: Ctrl + Shift + P

If it's the correct amount, it's safe to say this problem's being caused by temporary internet files. It can be fixed by clearing cached data and Intuit-specific cookies.
 

In the event it continues displaying an inaccurate balance, I'd recommend getting in touch with our Customer Care team. They'll be able to pull up your account in a secure environment, conduct further research, and create an investigation ticket if necessary.
 

They can be reached while you're signed in.

Here's how:

1. Use the Help (?) icon.
2. Click Contact Us.
3. Enter a description of your situation in the What can we help you with? field, then click Let's talk.
   
4. Select Start messaging or Get a call.
   

Be sure to review their support hours so you'll know when agents are available.

I'll be here to help if there's any additional questions. Have a lovely Friday!