You all know that recently Fontawesome upgraded their version to v5. They have changed the class name for multiple icons. For that reason, icons are not showing correctly on few plugins or theme with the Fontawesome v4.
Users are frequently getting this icon missing problem with Dokan and few themes. ReHub is one of the best Dokan compatible theme which is using Fontawesome v5. For that reason, few icons are missing from the vendor dashboard like as – Reviews, Reports, Coupons etc.