Syncing issues between Jobber and QuickBooks requires the third-party's support. Hence, I'd recommend contacting the Jobber's Technical Support Team. They'll be able to get a way to make it work.
Aside from that, you can also post to the Intuit Developer's page. There are engineers and developers that already have the idea when integrating the programs. You can do it through this link: https://developer.intuit.com/app/developer/homepage.
We'll be right here if you have additional questions. Have a great day!
Try open your QBO account on the private/incognito browser and connect it. As additional option, try connect the trial period of FP to your QBO as well for comparison.