Images in post after theme change

Hi @aglobefortwo,

Few things i have noticed like
1) your image url in posts are having some resize parameter, like this https://i0.wp.com/www.aglobefortwo.com/wp-content/uploads/2016/11/Halong-Vietnam-10.jpg?resize=768%2C768 , if you simply put this

<img src="https://i0.wp.com/www.aglobefortwo.com/wp-content/uploads/2016/11/Halong-Vietnam-10.jpg">

then it seems to go full width, i know you are using media uploader and thats why these additional parameters are there, but you can try with it.
2) Also, can you check by deactivating jetpack plugin once ?
3) Is your blog on wordpress.com hosting ?

Thanks,
Swayam