First issue… I haven’t a clue what beaver builder is and I’m not sure that the regulars here will either. We’re the kind of folks who write and work with code from the ground up, so we can advise on HTML, CSS or whatever, but we’re unlikely to know how beaver builder fits in to things, or it’s capabilities.
Second issue… We can’t diagnose an image; we’d need to see the associated code to be able to suggest how to centre it. You can provide the necessary HTML and CSS in a much reduced CodePen demo. Note that we don’t need your whole codebase (or a link to a live website); we just need a very small sample to illustrate the problem specifically noted here. You can use the developer toolbar (F12) to inspect the problem element and extract the pertinent markup and styles from your live website.