Not indexing correctly

Hi, have a beautiful word press site but am struggling to get some pages to index properly. I have added some calculators to my site but when I type in solar calculator in google search. my page indexes nicely but the link takes the user to the home page forcing him to have to navigate our menu bar in order to find the calculators.

https://www.google.co.za/search?q=solar+calculator&oq=solar+calc&aqs=chrome.0.69i59j69i61l3j69i57j69i59.2730j0j7&sourceid=chrome&es_sm=122&ie=UTF-8

Am i doing something wrong?