Some transparent objects like water and glass show textures from adjacent blocks when those should be hidden.
Some examples are included below, there likely is more (probably all) transparent blocks that are affected by this. As the last two screenshots show it also depends on the angle you look at blocks, it can also be different from block to block.
I noticed the issue with the glass only occurs with glass from this mod but the water leads me to believe the issue is caused by Rubidium. Removing Rubidium removes this issue.

water partially appearing behind other water:

glass fully appearing behind certain water source blocks:

the same glass disappearing behind different water source blocks and a different piece of the glass does appear:

and some glass behind other glass:

this is how it should look for comparison: