[1.12.2] Modern Warfare mod sights bugged with Simple Ores API (Simple Core)

Hello everyone ! I have a small issue with the Modern Warfare mod and the Simple Ores API, as the title says. When I just have Optifine (or any other mods) and Modern Warfare installed everything works fine but when I also install Simple Core the bug appears. Here is a video that describes the problem better than me

https://www.youtube.com/watch?v=hNQJ4CQ3KXA

An idea ? Thanks !