"I still see those fishes, there are still chimps, so why did they stop evolving if evolution is true?"
They didn't stop evolving. They continued to evolve along a different path than we did. They are just as evolved as we are, they just aren't us.
Let's try an analogy. Are you descended from Frenchmen? Are you living in the U.S.? If you have "evolved" to living in the U.S., then why are there still Frenchmen?