Why does syncing to the cloud mess up my budget numbers?

I am having a serious issue with the planning/budget tool. Whenever I am done budgeting and setting everything up, I click on sync so it can go into the cloud. However, Quicken will then add random numbers into the budget from the beginning of last year (when I didn’t even use Quicken). Because these categories are rolled over, it messes everything up for this month’s budget. So I have to keep checking back to make sure all the numbers are correct and then I have to reset the cloud data every single time. I also have to backup my file after almost every major change. This is extremely annoying and unreliable for budgeting! Has anyone ever experienced this? I wish there was a way to lock any month’s budget after it’s done so that the numbers don’t change.