ISO was overridden by turning the quick control dial after metering, and will reset to Auto ISO after metering timer ends or the photo is taken
BRIAN SAYS… When you are using Auto ISO and override the camera-selected value using the control dial on the top of the camera, it is only a temporary override. If the camera is set to Auto ISO, when the scene is metered, an appropriate ISO value is selected but can be changed by turning the quick control dial on the top of the camera. There is an indication of this as the small AUTO text turns grey to indicate that there is an override of the auto setting. When ISO is changed to a specific value from the menu, quick control display or before metering the scene, then it is set to that value and will not return to Auto ISO by itself. This was designed to avoid photographers forgetting they changed the ISO after the metered value was determined.