Hi in this part of the arduino site it show up weird for my browser:
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I am running windows 7 so that is the proper browser that needs to be used if you don't want to run into 3rd party troubles.
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Those chrome and firefox browsers will lure you with those 1,000,000 download developer count software but once I made a bunch of apps and stuff for all those good phones like iphone and google android I realized they are all fake, not even people you thought were friends would touch those, its best to stick with a browser that you can trust your data on, IE, the operating system that made it, IE does eventually hold gigabytes of history if you don't clear it sometimes though 
better to just take your time learn arduino, figure out what exactly you can do to speed it up with oscillators and things, add a tft lcd and par up with those business's rather than take there offerings that have direct access to your file system and realize there is no end salary just enjoy what you made for your self.
Chrome works correctly.
Firefox works correctly.
Edge works correctly.
Given the fact that you are so enamored with Microsoft you have two choices: 1. Get Microsoft to fix Internet Explore; 2. Use Edge.