Watched my aunt spend a whole family dinner last Thanksgiving telling everyone a local pizza place got shut down for "using fake cheese" because she saw a screenshot on Facebook. Turned out the place was open the whole time and just had a new owner. She never checked the actual page, just kept passing the post along like it was breaking news. Now when my cousins send me stuff like that I just ask them to link me the source and half the time they go quiet. Checking the brand's own page like you did takes ten seconds and beats trusting a random screenshot every time.

Check your water weight again, because 18 grams of coffee to 300 grams of water is closer to a 1:17 ratio, and most people pulling a balanced cup land nearer 1:15 or 1:16. That small gap can be the whole reason a cup tastes thin even when your beans are ground right. Try 18 grams to 270 or 288 grams of water once and see if it tastes fuller.