Hi jinda,
Please consider that you are talking about a 3rd party plugin conflict which is outside of our support scope. We will do our best to find out the problem cause but we will not be able to help you fixing it and you will need to contact the original developer of the plugin.
Actually it is not a matter of CSS. What you see on the checkout page is a placeholder for the actual tripe code which is embedded via Javascript:


So acutally the problem is that there are many Javascript errors on your website which might cause the issue. Please follow the steps below:
- Ensure everything is up to date according to our version compatibility list here. Please follow the best practices when updating your theme and plugins. Click here for more information.
- Test for a plugin conflict. You can do this by deactivating all third-party plugins, and see if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
- Remove custom CSS and Javascript from the options and/or Child Theme and test the case.
- If you’re using a CDN, please clear the CDN’s cache and disable optimization services.
kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case if you still have problems.
Thank you.