So I bought a couple of beers online and some of them seem to be way too carbonated. The moment I pour them into the glass, It's basically like a fizzy drink, and the head of the beer pretty much disappears in about 2 second. And for the mouth feel, it feels like I'm drinking foam. What do you think is causing this?
I've always though Budweiser and Bud Light suffered from this too. Years ago before craft stuff was even a thought, we called it Bud Gut, just a bloated feeling after drinking a few. But with shipped beers, maybe a few low filled bottles combined with handling and it just foams when opened I suppose.
Since you mentioned the head came out big but was fast to fade, I'm venturing to guess you didn't allow the beer to cool for long enough, and the C02 that wanted to get out on account of the higher ambient temperatures and jostling it got didn't get a chance to go back into solution, so upon opening, they ran for the hills.
Are the beers from a well-known brewery that you know had good quality control? How did the beers taste? Infections can be a cause of over-carbed beers, but usually an off taste accompanies that. Some beer styles, like saisons or farmhouse ales, are intentionally carbonated to a higher degree that most other styles, but your description seems to exceed that (unless the beers were too warm when opened).
I am no expert, but maybe if they were shipped warmed and bottle conditioned this could be the cause? I know some wild ales/ infected beers turn into gushers... that could be another option. Or maybe they were just crappy beers to begin with...?
I just brought a suitcase full of beer back to Colorado from a recent trip to Ohio and, after finding that all the beers had thankfully survived the trip, I made a point of letting those beers sit for at least a full day. I want all the gasses to be reabsorbed and any sediment to settle. So... I don't know if that helps. Hope you figure it out.