Because, technically, it's not an X sound, is a "c" like in χρώμα chroma = color
Om, everytime I put in the EXACT right awnser like word for word it says im wrong.
This might be confusing, but hee (chi) meaning x is only present in some varients of Greek which don't use xi, and eta meaning h is ancient, but Latin seems to combine both varients.
This example only works in Greek H and Color are not connected. Maybe this exercise could be tweaked