I've looked at several of the 2018 Topps Team Set checklists and they all have a "mini" parallel. I think whoever added these sets was confused by Topps' equally confusing way of describing things. For whatever reason, Topps started calling it's standard, separate issue team sets as "mini team sets." See here https://www.topps.com/2018-topps-san-francisco-giants-mini-team-set.html
I don't think there are actual mini variations of the base sets so I just wanted to get confirmation from someone else before I submit an error report.