Menu and catagory navigation wrong

I am struggling with the navigation on my blog https://www.top100childrensbooks.com. I have a category on the top menu titled ‘Age categories’ and when you click on this, the landing page has a sidebar navigation for the age groups. I have added a post to ‘Age 18months to 3 years’ but there are 2 problems with it;

1. When the post comes up, the breadcrumb reads ‘Home/age 18 months – 3 years‘ and you then have to click on the heading/image to get to the correct post of Home/Age categories/Age 18 months – 3 years‘.

2. In the post under home/Age 18 months – 3 years the image has been included in the top of the post and is distorted.

Please help as I have been trying different things for HOURS and am now quite frustrated.

Any help is appreciatede