In addition to allowing one item of annotation to appear at the proper size for multiple drawing scales, annotative content also offers the ability to have the position of the item to vary between scales. This is often quite handy, as the change in size may require a rearrangement of the annotation to have it read properly at each scale.
There may be times, however, when you want to reset all of the scales to match the position of one of the scales. Set the scale with the desired position current, and then use the ANNORESET command to do that. You can type that command, or use the context menus.
This also works with ACA annotative objects, such as Schedule Tags.