Box Carve/Design - Problem/Question

I designed a Box using Easel using the box APP.

Everything went sort of OK, except the box cuts where not aligned nor sized properly. I see that the app states something about dog-bones that I did not follow. Maybe this is related.

Any help appreciated! Look at the photos for the issues. As you can see the edges of the cutouts don’t line up :frowning:

Here’s a copy to my Easel project:
http://easel.inventables.com/projects/krh5QpQ6Vg-0pUabEH4fhg

PS: Another question: What are the units in the box app? I don’t seem to understand what units does it follow since it is not inch nor mm.