Hello,
I currently have the problem that when I use Optifine a texture bug occurs. So, if I have Optifine in my mod folder and on Resourcepack Organiszer for 1.8.9, then I don't see the textures from the texture pack, but from the default minecraft pack. How do I fix this? I've already looked but when I remove optifine from my mod folder the bug is no longer there, only if I have it inside.

Best Regards,
Philipp

1.8.9 is no longer supported, and since Optifine is closed source it's more difficult to make it compatible with other mods.

Ok, but can you tell me another mod that serves the same purpose, just for the 1.8.9?

I don't think anyone else made one.