Font Rendering on 2K screens vs 4K screens

We’re using the web font “anth”. We’ve noticed that on 2K screens, certain letter shapes render with an undesireable white line through the side of it. (As seen in the example)

On 4K screens this line isn’t there. 

Any idea why - and crucially, any idea how to fix it, either short term for us, or how I properly announce it as a bug for Adobe to look into?