It's nice to have you in the Community. I can provide information about paystubs showing a doubling of the gross wages.
Just to clarify, do you know if any checks have been voided or deleted? The reason for this question is because if a check is deleted or voided out of sequence, then it can display an old YTD total. For example, if you ran two checks and deleted the first one, the totals on the second check won't change.
However, this is largely just cosmetic and the taxes owed and tax forms will show the correct amount. You can check this by running reports, such as a Payroll Details report or a Payroll Tax Liability report. Additionally, this is generally resolved when another paycheck is created, which sounds like it already has in this instance.
I've included a video to serve as a visual demonstration of this. In this scenario, Jonathan was paid $800 on December 5th and December 7th, with these being the only two paychecks recorded for him. This will show what happens when the earlier check is deleted and how the most recent check doesn't have the totals change:
Additionally, I've included a video of how the totals update on the paystub when a check is run for December 14th:
If you're unsure if any checks have been deleted or voided, you may wish to check the Audit Log which tracks any changes made in an account. You can locate additional information about this in the following article: View Audit Logs in QuickBooks Online.
Lastly, since you've referenced that this is the second paystub, I recommend the following link: Payroll 101. Here you can access a free e-book that serves as a guide for payroll.
Please know that I'm just a post away if you should have any questions. Wishing you and your business continued success.