Multiple issues in Project: Getting items to rotate in circle motion, objects won't stick to main object, objects disaapear

Hey guys,
I’m working on a pretty important project for a client, and there are multiple issues, that I can’t seem to fix, and I’m really losing my mind here haha.

You can check out the video here so you know what I’m talking about: Dropbox

The first thing you notice right away, is that the second monitor arm just won’t show up, some times it did and then it didnt move with the rest in the cart, but now it’s just gone.

The second thing is at second 23, there are 4 carts in total, and I want them to move in a circular motion while they keep facing the camera, I can’t get that to work some how.

And the last thing is the power strip you see, similar to the first problem, the power strip just won’t move with the rest of the cart, although they are a child of the cart.

I need this to be done fairly quickly and so far nothing worked, (I need to render this on friday). And I know this is a crazy demand, but IF someone has the time and motivation to help me, I also uploaded the project:
https://www.dropbox.com/scl/fi/f3ajggz5kh9ie6o02gzei/ITD-Project.rar?rlkey=83023eijx9sf3gm9o2yv4o9xw&dl=0

Any help would be greatly appreciated as I’m really deperate here.

Thanks