Child Theme Problems

Hello everyone,

I already started to work on the website when I found out that I need to create a Child theme first. I tried to do it by myself using the guide and with different plugins but I always get the same problem.

After I active the Child theme my website changes.

The way I want it to be is a current appearance of the website: https://www.girlsxchlamydia.nl/
This is how it changes when I activate the Child Theme: https://snag.gy/vMovn.jpg

What should I do in this case? What needs to be changed? I also tried to do the circles as pages and not posts through the Child Theme but it didn’t work out either.

The link to the website: https://www.girlsxchlamydia.nl/
This is a school project ??

Thanks!