Looks like Jive probably prioritises this differently to what's expected.
It doesn't look to me like a priority issue, it looks like some sort of discrepancy with last-update dates.
For example, the "Azure sphere kit" discussion shows up near the very top of the Content tab based on a very recent update date
of September 10, 2019, but on the Overview tab it shows up on the 3rd page of results, showing a last-update date of "4 days ago",
along with all the other 4-day-old discussions.
So there doesn't seem to be any "prioritization" going on in the Overview tab that would cause discussions to be
either omitted entirely or moved down in the list.