For some reason you can turn the page upside down on your laptop or pc. It is very easy to solve this problem.
You turn it upside down by pressing CTRL + ALT + DOWN ARROW.
So if you have the problem, you need to do the opposite: CTRL + ALT + UP ARROW.
Don’t ask my why it is possible to turn the computer screen around like this.
But it’s great fun to turn it on someones PC while they’re not looking.