The Read More is being used because it is using unsupported blocks this content is loaded as a web fallback.

With this, your users can view all of this content within a modal. We cannot predict in advance how tall this content be because it's loading within an iframe so the only way that we can ensure that all of the content will always remain visible is to load the full content within a modal to allow for this infinite scrolling.

You can also check the supported blocks on the BuddyBoss App by visiting this page:https://www.buddyboss.com/resources/docs/app/app-content/supported-gutenberg-blocks/