Only one of my child pages is showing. Please help.

I don’t think anyone understands what you mean. You will have to be more precise in the description of your problem.

If you go onto my site.

https://www.thesopltimes.com

under the page leagues in the header there are two child pages underneath but only one is visible due to my header image.

Jay

Looks fine in my firefox.
My guess is, you will have to read a bit about a lovely thing called z-index.