I was copying a container with a left property of 5% and it was not copied to the new container during the copy/paste.
This is on purpose. If you copy a control on a form and paste it again, it will
‘disappear’ if you paste it without bumping the coordinates, since it will be exactly on top of the control it is copy of. By bumping the position a bit, the developer does not get confused.
Ahh, Explains why I was confused.