Hello,
Usually when things are appearing fine under the Page Builder editor and not on the Site Preview then it is mostly related to Cache being the issue. So, if you are using any Cache plugin on your Site then make sure you purge and clear all Caches using that Plugin Settings before previewing your Site and your Site will appear fine by then.
If you think that is not the case in your regard, then kindly elaborate your issue further with some useful Screenshots and Page URLs so that we can further check and assist you accordingly.
Best Regards