Thanks for visiting our forum, @Ceflick10,

Have you tried opening your account in a web browser and checking if the Cost is showing there?

This will help check if this issue is caused by the large data in the cache. It stores your browsing activity and will constantly overwrite itself without deleting the old stuff. This will likely cause QuickBooks to function poorly.

The private window will not save any history making it a good place to identify browser problems. To start incognito mode, use these keyboard shortcuts:

• Google Chrome: press Ctrl + Shift + N  
• Mozilla Firefox: press Ctrl + Shift + P
• Safari: press Command + Shift + N

If you no longer see this alert in private browsing, clear the browser's cache. This will help delete the history of the browser, so you can start in a clean slate. 

I'm adding this article about the Projects feature in QuickBooks Online: Track income, costs, and profitability by project.

Let me know how it goes in the comments. I'll be right here if you need anything else about Projects. Have a good one!