Icon gone after I rearrange their location

[matslin]

I try to change some ui's icon location, (kosmos' PerformancePanel)
I was hoping to change it into a row of icon which fits my UI space

but after I log in, it become a black panel

when I move my mouse to icon location it still show up the correct tool tips

but I can't see the icon

can anyone help me with this?

Edit: everything works fine in UI editor, but in game it's just a blank panel