When the world generates instead of what i presume to be black concrete it instead generates them as a cyan block

What do you mean? Can you clarify?

So essentially when I spawn into a world it seems like a majority of the buildings, and the highways are made of cyan terracotta. (Instead of what I presume would supposed to be black). I’m not sure how to fix this. If this is the intended design then would there be any way to change it?

This is intended. You can change that by changing the assets but I personally like cyan terracotta which is why I use it a lot.

Here is some documentation on the LC asset system: https://wiki.mcjty.eu/mods/index.php?title=Lost_Cities