This seems to work here. Can you confirm it's a smart class parameter override you're changing?

The first screenshot is my audit log, showing when I first clicked the Override on the host and saved it, then when I edited the host and changed the override. If you click the fqdn=... bit, you'll get details for the entry which are shown in the second screenshot.

Choose a host from the hosts-list, edit the host, and change a param of one of the inherited classes. This doesn't appear, when you click on audits on the host details page.
I would expect to see the changes made on the host there.

Adding two screenshots, one of the general audit page, one of the host details audit.

no reaction, closing