It was normal at the beginning.But when I clicked on it, it turned black.But when I click into the parent item to check, it seems fine.So what exactly went wrong?
（它一开始是正常额，但当我点进去之后它就变成了黑色的。但当我查看它的父项，看上去又没什么问题，所以到底是出了什么问题？）
