Task by high results per host

Hi everyone,

I have a weird issue with dashboard indicator on scan page.
I have 4 scans with high results, and when I had only this 4 scans task, there are all displayed in the “Tasks with most High results per host” and “Tasks by hgit results per hosts” (table).

I started to create many scan task, and as I created more, tasks disapeared from the 2 indicators…
At first one, and more I create tasks, less I have tasks displayed in high results.

Here a screen:

If I remove scan tasks, there are come back to the both indicator. At first 1 more, and if I continue to remove new task scan, the 4 are back.

If I create a lot of task, list become empty:

Any idea ?