Thanks for your answer.
The problem of an adblock interfering was also what I was suggested on the Jackett github, but the problem is that I have no firewall or adblocker I know about. There is nothing of that type on my pi, nor on my router. On my PC, I can perfectly access all these trackers, so I think I can exclude the router ?
I really don’t know where I should search for this issue.
Is there things I could test or info I could give you to get clues ?
Thanks in advance for any answer.