For some reason, when I visit the website this morning, the URL now has:

'preprod' in it, e.g.
https://preprod.united.com/web/en-US/apps/booking/flight/seatSelector.aspx

I work in IT, and preprod sounds like Pre Production to me, so why are they pointing me to a non-Production website for me to make changes to my flight? Or maybe preprod means something else.

Anyone else getting this issue?