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Let's fix the error you're encountering so you can start reconciling your accounts, @Anonymous.
First, try to check all the columns. You can do it by following the steps below:
If the error persists, try to clear your browser’s cache. It's possible that piled-up cache in your regular browser caused this unusual behavior.
Go to your account by using a private browser or an incognito window. If it works fine, clear the cache in the one that you're currently using.
Here’s how to go incognito or use a private browser:
Then, follow the steps in the clearing temporary internet files and cache article. You can also proceed by using other browsers if the steps above don’t work.
Check this article for more information: How to Reconcile an Account in QuickBooks Online.
Let us know if you need further assistance in reconciling your account. We're always glad to help in any way we can. Have a wonderful day!