Title says it all. Here's a picture:

Versions:
OpenBlocks-1.12.2-1.8
IC2Classic 1.12-1.5.4.0

Any way to fix this or is it entirely on Openblocks' end?

That is openBlocks issue because i use the normal translucent blockrenderer, there is nothing that i can do to fix it.

@OvermindDL1 for the Glassfiber cable and mc only allows 1 State per Block.

Instead of using transparency for glassfiber why not using a masking texture on it instead? The MC engine handles transparency exceptionally poorly so it's good to avoid it.

@OvermindDL1 because since 1.8 if a block isnt marked as Transparent the texture will be made opaice too.

Yes, that's fine, masked texturing is opaque.

Why translucent? The cable is not translucent and putting it into the opaque renderer would fix it too.

Have you tried using CUTOUT rather than TRANSLUCENT? It implies a little more solid but still doesn't have the shadow problems SOLID has.

back then when i build it i tried it that was not working as intendet, so translucent it was.