Validation not working

Hi, I promise this is the last issue from me - I am so close to having finished.

Last problem though is my validation no longer works. I have added a filter to turn the meta box default button into a save button, and then at the end of my form added another submit button:

         [
                'id'   => $prefix . 'form_submit_button',
                'type' => 'submit',
                'std'    => __( 'Done', 'your-text-domain' ),
                'columns'    => 12,
                'save_field' => false,
                'tab'  => 'page_22',
                'attributes' => [
                    'class' => 'form-submit rwmb-button rwmb-form-submit',
                ]
            ],

However, when it is clicked, it shows the alert that not validated yet continues to process and save post. How do I make my button behave like the default meta box button? Is there a configuration I am missing. Couldn't find anything in the docs.

This is my shortcode: [mb_frontend_form id="academic-research-summary" ajax="true" post_type="research" confirmation="Saved"]