This is about a bug in the forum itself.
The last post time appears to be incorrect in the parents forums and does not reflect the actual time of the latest post in any child branch.
For example this morning, when in the “support center page”
Support Center
It said last posts in the “Vue Hardware and installation” was 4 days 11 hours ago
But opening the “Vue Hardware and installation” it showed posts with as little at 7 minutes, 14 min, 19mn, 25mn, 3 h 49mn…
I am wondering if the Parent forum last post is only looking at the last thread creation time instead of the last post creation time in any post.