whiteboard section covers the elements and moving to back it disappears

[Kathy DiSandro]

I created a section, added jiras.  Somehow, don't know how, the section is covering the elements. I highlight elements and 'bring to front' and nothing happens, the section still covers them. I move the section to the back and it disappears, can't get it back. 

I dont know what caused it to happen and I dont know how to resolve it once it happened.

[Kathy DiSandro]

I figured out how to fix it (create a new container and move the elements in to it), but I don't know what caused it and how to prevent it from happening again.  It has caused rework multiple times today.

[Kathy DiSandro]

I figured out how to fix it (create a new container and move elements into it) but I don't know how it happens.. it's happened a few times today so it's causing rework.