Yeah, this one's common and totally normal after a fresh install or filter change. You're seeing a ton of tiny air bubbles trapped in the system.
They're harmless and will clear out on their own as the system runs. Just let the faucet trickle for at least 15 minutes during the initial flush to help push the air out. The water will turn clear eventually.
If the cloudiness isn't from bubbles and looks more like black specks, that's loose carbon from the new filters. Flush the first three stages into a bucket with the RO membrane line disconnected until the water runs clear, then reconnect. You should do that flush whenever you change the first three filters anyway.
So, bubbles = fine, wait it out. Black flecks = flush the pre-filters.