Thanks for checking in with us here in the Community, kathy46.
I'd like to check this for you and get it of taken care myself. However, all third-party applications (non-intuit) will no longer have access to their software.
I'd suggest getting in touch with Job Nimbus on how to prevent the project status from marking as complete once it syncs in QuickBooks.
For now, as a way around, I'd recommend changing the project's status manually.

You might want to go through the following article. This link contains more information about other ways to deal with the project feature in QuickBooks Online: Projects FAQ.
Let me know if you have additional questions about QuickBooks I'll be available in the comments to assist you further. Have a nice day!