Basically what the title says, I've tried Continuum, Seus and Sonic Ethers to name a few. The tracks look great and work fine with the shaderpacks, its possibly a problem with the settings for the shader mod or the way the stock are rendered. Anyways thanks for reading.

In-game screenshot of the issue

What shaderpack you use ?
Im using SEUS v.10.1 and that issue does not appear.

im currently using SEUS 11.0 but it also happens with the latest version of continuum so im assuming its my settings

Having the same issue as well with SEUS Renewed 1.0 and SEUS 11.0. Attempted to turn off as much as the advanced settings as allowed but nothing changed.

So assuming it's just a problem with the latest version of SEUS, I'm guessing I could downgrade as a temporary fix.