You know, I always found those ", yes?" at the end of a sentence weird. A ", right?" would be more fitting. So I asked my mother (an English teacher) if it was right, or if it was a certain country quirk, and she said it was most definitely wrong.
So I searched and found this: https://www.quora.com/Why-do-other-Europeans-often-end-sentences-with-Yes-when-speaking-English-as-a-second-language
And it coincides with what my mother told me.