DUP! packets with Aruba sites

Hello everyone,
last Friday I noticed an annoying issue with my home network.
When I ping or send any kind of packet to an Aruba hosted site, I get
duplicate packets, even when pinging aruba.it itself.

I’ve experienced this issue only on my home network with Aruba sites: it
doesn’t happen at work, with mobile data or at home pinging google.it.

I’ve got a Turris Omnia router.

Could you please help me solve or at least troublshoot this DUP! issue?
Thank you.