Custom Collar Question

[Slut Fallen]

So, I've been having a lot of fun playing around with custom collars, but I noticed something. I'm using the recommended image size for my texture, but it seems the tops and bottoms of my collar end up some random color. Usually white, though once it was a golden color. I don't mean the front facing part, but the actual ittttty bitttty strips of the tops and bottoms of the prim.

I've seen other collars where those parts are actually the same color as the rest of the collar, I'd like to know what I'm doing wrong here. lol. Any help would be greatly appreciated.