Odd borders on NPC dialogue buttons

[Pyroman]

I've been modifying the default UI image files and have not running into many problems. But I am having a problem with the NPC dialogue buttons looking funky. both the left and right side of the border in the middle seems to have some borderI haven't seen. All the other buttons in the UI look just fine but for some reason these have the weird artifact. When I take out the buttons_master.dds file it still has this artifact just with the default buttons.

Basically I need to figure out why that stays there or if what image file it is using to put that odd artifact there.