Is this Illustrator artwork? If so, try resetting the 0,0 origin coordinates of the artboard to the upper-left corner of the canvas. If Photoshop, try resetting 0,0 on the rulers in a similar way.
Clicking the Refresh button in the lower-right corner of the Scene panel doesn't help? Does Alt/Option-clicking it? Does reimporting the artwork and adding it into a new scene help?
Is it possible to send me a copy of the artwork file so that I can diagnose here? In case you don't want to share the file publicly, feel free to send me a direct message with a link to the file. Thanks!
For others reading this thread... the issue was that the 0,0 coordinate for the artboard was below the artwork (i.e., the artboard's upper-left corner was negative), and Character currently uses the artboard 0,0 as the scene's upper-left corner.
To work around the issue, just reset the artboard coordinates, as follows:
1. In the toolbar, click Document Setup.
2. Click Edit Artboards.
3. In the toolbar, set the Reference Point to the upper-left corner, and then set X and Y to 0, 0.