Looks to me like you're using a clipped panel that clips your UI, but you must be using a non-NGUI shader on the font that prevents it from being clipped.
Thanks, so I changed its panel option to [dont clip], so when moved at above panel, it shows all.
1. But still I can't click it, why. Box collider still lived.
2. and when I click and drag card below, it does not show with mouse movement. How can I show it most front above on camera?