DC size changes when I add inside another DC


I am doing bespoke boxes using sketchup dynamic component for the CAD process and VCARVE pro for the CAM process.

I have built dynamic boxes that works perfectly.

To ease to produce process, I have recently decided to add inside each piece of another dynamic component with fixed dimensions inside to number each part.

But I have issue when resizing

if I add another DC into the bottom piece for instance, then when I resize the entire boxes, here is what I get

Can you please help me out with this issue ?

post your file either here or private message if sensitive

Can you please send me your email address ?
Thank you