How to change Incorrect Apple ID in Apple Store

The Apple Store on my iMac indicates I have an update.

I go to the store and select Update All.

It presents a dialog box with the password field active.

However the Apple ID field that is inactive (faint grey) shows my wife's Apple ID.

#1 Can I find out how my wife's ID got there?

#2 Though it shows that I'm signed into the Apple Store with my Apple ID, it presents this dialog box with my wife's. And if I sign out of the store and sign back in the same thing happens. Really weird.

I decided to click on the "forgot Apple ID or password". It asked me to confirm all my account info including credit card and then said they would inform me in a couple of days. Very odd.

Any suggestions?

Thank you.