Does anyone know the reason of $1,000 on Part VII Young Child Tax Credit (YCTC) #24, which I did not claim? #28 in the same part is blank. Should I just ignore this?

If you'll look at the paper version of California's Form 3514, California Earned Income Tax Credit, you'll see that $1,000 is pre-printed in line 24, Available Young Child Tax Credit. 

The $1,000 you're seeing is used in the computation of the credit, acting as a maximum credit.

Since you're not claiming the credit, just disregard the amount.  It's just part of the form, anyway.

Thank you very much John. I really appreciate your help.

I had the same question, was so confused about line 24 because I kept seeing $1,000. Thankfully, I found this reply and my taxes are good to submit. 

Thank you for your help!