Hi there,
It seems that there are issues on our end where we should always follows time format set on your events. I have made temporary fixes on your site and it should works fine now. Please give it a check and see how it goes.
By the way, for old links, you need to scrape them first in order to fetch it latest details. You can scrape them here
https://developers.facebook.com/tools/debug/ until it fetch correct details.
By the way, this fixes will be included on our next release version.