Cruxia?
What you're experiencing isn't a bug; that is her actual mechanic. The whole ordeal with Cruxia is a huge game of "Hide and Seek" in which you have to find her on your cameras before she gets into your office. I can't go into further details as it would be too much of a spoiler for those who haven't experienced the game yet but here are some things to take note of: Cruxia moves very fast and she's a shapeshifter with the exception of the colors of black and red.