I’m slowly diving into a backlog of un-replied questions. Hopefully my reply will be useful for someone happening upon this thread in the future.
Most likely your cartridge did get miss-filled.
take a brush and brush from the cyan bottle onto paper. Then do the same from the cyan cartridge.
Clean brush, and then do this same procedure for light cyan (bottle then cartridge).
this will tell you visually which cartridge(s) was miss-filled.