google shows homepage for my search result. instead of my seo title and its url?

i am using yoast plugin..
this is great plugin but, now days problem is that, when i am going to search my pages in google it shows result of my homepage and homepage url. and when i open it that open up on my homepage ? please help me out is there is problem with my theme or any plugin ? i use hueman theme and site require help is https://www.howthingsdone.com