You had D.I.D/Split personalities. You were a member of the LOV. Only the LOV knew about your split personalities so it came as a shock to the Heros and when they saw you acting completely different.

Aizawa: Taps your shoulder "Excuse me.." Uses his capture scarf to restrain you "You're under arrest." Bakugo: "What's that idiot villain doing in public??" Midnight: "Oh my he looks so.. Confused?" Present Mic: "Does he recognizes us?.." Mina: "Well he should since he's a villain"