Layering issue

I have a hotspot using a custom button image that does not want to go on top of another semi transparent PNG element. I tried moving it up and down the hierarchy in the scene, checked the transparency and made sure its 100%, but its not cooperating. It is working fine in other situations with other elements that are actually the same but just different color.

I'm wondering if I encountered some weird display bug. if I hide and UN-hide the elements in a certain order it will display correctly but only in editing mode. Once I test the course, the button is again where it shouldn't be. It happens sporadically, but this is about the 3rd time I have this issue...