B2 Visa for Parents with 221g wen applied for extension

HiVisa was not stamped for my mom ,they received white slip 221(g) asking for - 1. Appear for a consular interview, Its written No appointment needed. & 2. On the backside of this 221(g) doc, is printed a 214(b) document with no check marks on it What does this mean for my parents B1 visa as they were applying for an extension… Does this mean that the visa is denied ? Has anybody had the same situation with the B2 extension ?

Thanks in advance