Shapes change alignment in preview mode

BarbaraEdwar395​: Weird—especially since the inner circle isn't centered in its bounding box.

As the staff would say, be sure you're working with the Storyline file on your local hard drive. (Because: working over a network can corrupt a file.)

You might also want to quit and then relaunch Storyline. (Because: gremlins.)

Then, try this: Delete those objects, and create new ones. (It's amazing how many "quirks" go away on a do-over.)

Potential workarounds so you only need one object:

• Line up the circles in editing mode, and then use Merge Shapes to combine them. 
• Insert the smaller circle directly into the Normal state of the bigger circle.
• Create the concentric-circle effect by filling the big circle with a "gradient" fill that shifts from green to white at the desired intervals.