We’ve built a basic game HUD for our game and everything seems to look perfect on PC and Android but there seems to be a weird border surrounding a few images on iOS. Find the problem attached in the screenshot marked with a white circle. The buttons are getting white border lines on their edges.
I do not have this issue with my UMG buttons on iOS. Let’s compare setups and maybe this helps to resolve your problem: I have a normal button and under the Style attribute at Normal I set an image and set Draw As to Box. My Margin is 0.0 and the Normal Padding is 0.0 as well.
This issue was sorted. Problem seemed with Texture Tiling Method in X and Y. The tiling mode ‘Wrap’ was causing this issue. Changed it to ‘Clamp’ and now it displays perfectly.
Could you write this down as answer and accept that please?
Just so other people know you don’t need any additional help here 
Thanks!
*and if that doesn’t work, the solution is setting FILTER to NEAREST.