Is that normal ? Is there a way to turn them off ?

I know this is 2 weeks late, but you can also unzip the shader, go into shader.properties, and adjust whatever you want to behave in that manner. I've done this on several modpacks to make (most) of the modded ores glow, but it stands to reason the inverse works as well.

doesnt fit the issue but could go more in detail how to add ores from mods to also glow? I've also noticed normal ores like diamond that are nested in new blocks (like new stoneblocks) do not glow. Any fix for that?

I know this is 2 weeks late, but you can also unzip the shader, go into shader.properties, and adjust whatever you want to behave in that manner. I've done this on several modpacks to make (most) of the modded ores glow, but it stands to reason the inverse works as well.

doesnt fit the issue but could go more in detail how to add ores from mods to also glow? I've also noticed normal ores like diamond that are nested in new blocks (like new stoneblocks) do not glow. Any fix for that?

I don't know exactly how off the top off my head, but the emissive ores should all be grouped together, I just did a quick search in the file for _ore and added stuff on there while matching the formatting.

there is an way just go to: shader options -> PBR config -> integrated PBR -> Emissive Config. there are all the options for emissive textures.

I know this is 2 weeks late, but you can also unzip the shader, go into shader.properties, and adjust whatever you want to behave in that manner. I've done this on several modpacks to make (most) of the modded ores glow, but it stands to reason the inverse works as well.