Dude, just don't use the Samsung built in browser at all. It's absolute garbage and no web developer actually works to support it. This won't be the only site you'll have issues on. Im on an S8 right now using Chrome. You can set a different browser as your default which is what I'd recommend
Dude for real I like this phone a lot but I HATE that Samsung made it so you cant disable the Bixby button anymore. I go to turn down music & get that stupid assistant everytime! I had it disabled until they updated me & now I think it's impossible unless I make a Samsung account ?♂️