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I checked the same issue on my end and replicated the same issue with you. The title doesn't change when you update previous one and post it on Facebook. So, I'm going to open a ticket for this one and our developers will be on that issue to find a fix for it. When there is an update about this issue, you will be informed from this thread via email.
Thank you for your understanding.
Facebook crawls a webpage then gets the title from the page's source. Unfortunately, Facebook stores such information in a cache. Thus, the title you're seeing is what Facebook has in their cache.
It would be up to them to refresh their cache so the latest title will be displayed. With that said, we won't be able to do anything about. We're really sorry about that.