Well, how can I explain this to you'll

This time I start the laptop and something feels wrong again. I mean : right. I start Word to see if I needed to squint when editing my documents, but it looks familiar and comfortable. I swear I am not playing tricks here.

I went to display settings and it was on (1280 x 720) with many other options available.

It is back to normal. But how ???
And can I prevent this from happening again ?? Especially that these days I am overly stressed about multiple issues (one girl's marriage, one girl's birth - she and her 3 kids are with us - and house remodelling project, in addition to some extremely important paper work I have to do online using this laptop with deadline approaching fast)