Is it possible to remove background image in page title in blog posts?

Thank you for your question!  It is very likely that the background image set for your website is getting pulled into your blog post titles and you can overwrite the default styling using custom CSS.  Please let us know which theme you are using on your website and we will do our best to provide you with some CSS to make this design change.

This is the CSS you will need to remove your featured images from header on your individual blog page:

.single .entry-header {
    background-image: unset !important;
}

I hope that helps you create the design you are looking for and please let us know if your have any additional questions!