Calamity armor disappeared when I entered Runed Monoliths map

Hi, I just had a super weird bug, when I entered the runed monoliths map I noticed my heralds were not working and I saw that my Calamity armor was gone. I ported back to hideout, searched in my inventory in the annoint window and it was nowhere. I closed the game and entered again, I appeared inside the runed monoliths map with the Calamity armor back. WTH? XD