Thanks for letting us know about this. I’m sorry your print didn’t turn out the way you expected. As @jbmanning5 pointed out, there was once an issue with our software that would allow a user to press “Print” before artwork had finished rendering in the Workspace - as a result, only the rendered portions of the design would be printed. That issue should now be resolved. Additionally, this problem would only occur on designs containing a large number of drag groups. I extracted the logs from your Glowforge to investigate, and it appears that the box from your print had a very small number of drag groups.
It does appear that one of the boxes in your design is just a pixel or two shorter than the others. This box printed successfully, but the others did not. It’s likely that @bill_laba is correct, and the other boxes were positioned off the material. Could you please open your design in the app one more time, select the same material that was used for yesterday’s print, and let me know what you find?