My daughter who has moved to Taiwan when she was 3.5 years old, tend to like to read in Chinese better in English even though she is raised bilingual. Now, we homeschool our kids, and she always showed resistance somewhat when it comes to English reading. Even though I am always with the attitude that this is something she must learn, so, she needs to just accept the fact that she needs to do it. I don't force an aggressive curriculum on her and I don't scold her if she is slow picking it up (after all, she did go to local elementary school for 1st and 2nd grade). But, that day, she took the initiative and asked me the question because she noticed there are places where "c" is pronounced as "s" and "k" and "k" is pronounced "k." This was the first time ever that she asked me a question related to English learning!
Maybe she was slower than other kids (they learned this in 1st and/or 2nd grade). However, she took the initiative to ask instead of being taught and being told. That makes the world of difference to me.