I can't hide a white line in Shape Layer

Layer styles seem like a culprit
One time I was working with shapes and this white line kept appearing at the edges

I fixed it by deleting the layer styles I applied earlier. (Mind you I had even turned off the effect, but the line only went away after I deleted the whole effect in layer styles 

cropped screenshots is a big NO NO here. we can't see what goes on there. show us more please. all the layers, all the interface. select all the layers and and press UU so we can see all the modified properties. more information about your project could be helpful too, as well as Ae version and OS full numbers. don't worry, we'll find the sucker