Posted before about other cats somehow getting in the microchip cat flap. Turns out they're super smart and can pull the flap open from the other side.
Boy and girl cat have been kept awake most of the day, the flap is locked and covered in tin foil. Hoping a few nights of no entry will stop the intruders.
Our cats are mega night time explorers and zoomers and I am not looking forward to the first night of them being locked in!