I'll take a wild guess and assume they are of a German or Polish language background. Wait 'til you encounter a French person who accidentally uses guillemets if you want one even «weirder».

Or the Nordics ”like this” or the UK ‘like this’ or Japan 「like this」. Basically every country has their own standard: https://en.wikipedia.org/wiki/Quotation_mark#Summary_table

Correct. Swiss German keyboard.