When I am entering a new expense and I save, the previously entered expenses are duplicating

Hi d_kconsulting,

Welcome to the Community! QuickBooks Online makes it fun and simple to manage your business. I can help shed some light on what might be happening with these expenses that you're entering. 

In QuickBooks Online, there are several automation features meant to streamline the entry of data. One of these features is the Pre-fill forms with previously entered content feature. It sounds like there could be some sort of glitch occurring that's causing the system to duplicate the previously entered expenses, so the first thing I suggest is making sure the pre-fill option is turned off. Here's how to check this setting: 

• Navigate to the Gear icon, then click Account and Settings. 
• Go to the Advanced tab, then scroll down to the Automation section. 
• Ensure that the Pre-fill forms with previously entered content option is toggled to off. 
• Once you're finished, click Save, then Done. 

If this setting is already off, the duplication could be a performance issue caused by a build up of cache and other data within your internet browser. I recommend trying the following troubleshooting steps, checking between each to see if the issue is resolved: 

• Clear your browser cache if you're using a browser
• Clear the app cache if you're using the QuickBooks Online app for Windows or Mac
• Try a browser if you're using the app
• Try a private browser window
• Try another browser type
• Make sure you're using a supported browser and system
• Reset your Internet or try on another computer or device

If the issue persists, please reach out to our support team outside of the Community. This way, they can privately collect your account information and take a look at your company to determine what's causing this to occur. Here are your options for connecting with them: 

Phone: Call 1-855-253-1536 from Monday to Friday from 9 a.m. to 8 p.m. EST.
Schedule a Callback or Chat: Click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat. Support is available from Monday to Friday between 9 a.m. and 8 p.m. ET.
Social Media: Facebook, Twitter, and Instagram.

It'd be best to reach out via phone or chat so that the support agent can use tools such as screen sharing to take a look at how the program is behaving. 

If there's anything else I can assist with here in Community please let me know!