Why does my website display images without a border for certain color options?

[Guribabo]

Hello.

if I choose black option in color, black image appears with a border.

but if I choose white, white image appears but without a border and also if I move to the right picture when I'm choosing white color, another white image appears. 

I attached photos, hope it make sense and please help me.

My website url: https://guri.store/

Please make me website more functional and clean. these things doesn't meet my expectation and not functioning well.

Thank you.