It would have been great if you'd have come to the Forum much earlier.
The workflow you followed was:
Sketch -> Body -> Component
A better workflow is this:
Create component(Empty, activated) -> Sketch -> Body. This is:
Fusion 360 R.U.L.E #1
When in doubt, before doing anything, create a component and make sure it's activated.
All objects created after activating the component such as sketches, bodies, construction geometry, joint origins, etc. are created in that component.
This has several advantages:
- On activation the timeline is filtered to show only those items in the timeline that pertain to that component. That will make the quickly growing timeline much easier to work with.
- If a component is exported to the data panel with "save as" this will also export the complete parametric design history.
The joints in the "Assemble menu only work with components.
- Drawings can only be created from components
- Only components show on the BOM
When another component needs to be edited for example to add geometry, it should be activated before doing so.
Fusion 360 R.U.L.E #2
Name your stuff!
You did not follow these guidelines and in essence the effect is total disorientation. It is very difficult to navigate this design quickly and figure out what sketch belongs to which body.
Also instead of moving components, either with the move command or simply by dragging it around in the viewport, in several cases you moved the body within the component, which moves it away from the origin of the component. This is likely the reason why you see some of the joints behave strangely.
If you single-left-click on a 3D object in the viewport something highlights. Either a point, an edge, or a face of that 3D object. If you watch the browser you'll see the blue breadcrumb highlighting will lead to a body
To highlight a component you need to double-left-click on an object. The highlighting in the viewport will look distinctively different and in the browser you'll be able to see that a component is highlighted.
This far into the design I am not sure what other advise I could provide to move forward.