QB glitching app on IPhone 16 plus OS 18.3.2

I appreciate you for reporting your observations of the unusual behavior you encountered while working with invoices. An accumulation of historical data can cause unexpected behaviors, Mountain. Let's go through some basic troubleshooting steps to resolve this.

Before we proceed, ensure that your app is updated. Once you've verified that, we need to refresh or clear your app's data. This process will help eliminate any issues so the program runs smoothly. 

Here are the steps to follow: 

1. Open your Settings, then tap General.
2. Tap iPhone Storage. Choose the QuickBooks app.
3. Click Offload App.
    

If the issue continues, I recommend uninstalling and reinstalling the app.

Once you've gone through all the troubleshooting steps and the issue persists, it's best to contact our live support team directly. Our experts can thoroughly examine this behavior and uncover the root cause.
 

In the meantime, you can open and preview your invoices using your web browser.
 

For future reference, you can visit these resources as a guide in handling your invoice payments and customer's balances in QuickBooks Online:

• Record invoice payments
• Create and send customer statements
   

Following the troubleshooting steps will help fix issues caused by outdated or corrupted data. Also, contacting our live support team is a proactive way to get to the bottom of this. If you need more assistance with managing your invoices, let us know.