CA did this a few years ago....annoying!   They tried to tell us a miniscule percentage of taxpayers were asked for this additional data...but in my office, I had at least a dozen clients with this issue.  I was able to clear them up with a phone call and a fax to the tax practitioner hotline for the state of CA, it was a time suck that I didn't get paid for.

It's nothing you're doing or  not doing, its some kind of communication gap between the the agency that collects payroll data vs. the agency that processes income tax data.