Subgit SVN commit does not update "Last Update"

I have created a Subgit mirror of an SVN repository in Gitlab. When commits are made to the SVN Repository the synchronisation of the git mirror works perfectly. When I look at the project on the Gitlab page it also correctly shows when the project was last updated.

However, when I look at the Projects overview the “last Update” value is not correct.

Is this a bug, or is there a way this can be solved?