Check your Brave browser's Settings' Social Media Blocking. There are several toggles - Facebook, Twitter/X and LinkedIn - to allow embedded posts to display in your browser. If it is not enabled, then the embedded posts won't show - i.e., Brave block the social media's embedded posts such as Twitter/X, Facebook and LinkedIn by default.
Instruction on how to allow Twitter/X embedded posts to show up in Brave browser:
1. Click on the hamburger icon (three bars).
2. Go to Help > click on About Brave.
3. In left sidebar menu, click on Shields > scroll down until you see "Social Media Blocking" section.
4. Enable the toggle on for "Allow X embedded tweets", which will display the embedded Twitter/X tweets.
5. Refresh the CIK forum page. You should be able to see the Twitter/X embedded tweets/posts.