error dependecy with SpriteAtlas

[CodeMasterYi]

I find an rediculous dependency with sprite atlas.
a simple texture(png file) depends on a spriteatlas...

I only set the bundle name of ft_circle1 "xxx".
then it shows us that the texture depends on UI#Lobby(master atlas) & [email protected](Variant Atlas). I cant figure it out!~

ft_circle1 was in the atlas, but now it is NOT!
I wonder if it is caused by atlas cache, so I delete AtlasCache under Library and repack the altas. But it doesnot work!
Please help!
Unity 2018.4.21f1~