Two identical Reindexing tasks at the same time

[SecondSight]

Hello !

I've upgraded to version 3.1.14 and now MySQL and a reindexing task started.

I don't know why, I ended up with two instances of each tasks running at the same time (the only change I did yesterday after the upgrade was modifying the search control value for one of the member Groups, because I saw the same search query being ran in my mysql slow log file). This morning, all the tasks have ran, but there is still one :

What should I do in your opinion ?

If I click on "manually run them now", I see the rebuilding figures go up, then down, then up, then down as if it was blocked or updated twice...

I wanted to stop/cancel this and restart a new posts rebuilding task, but I don't know how to achieve this.

Thank you !