They are probably just from a country that uses commas instead of periods and they simply forgot that they had to switch those.

The problem is that most people rate the first way. If a place has a rating of a 4.5 and I thought they were pretty good, but not perfect, so they deserve 4 stars, I am not going to rate them. Having 4 stars is usually considered not that good, so lowering their score is not what I want to accomplish as 4.5 is pretty fitting in the context most people have. That leads me to giving 5 stars relativley often and not rating ok or just good places at all.

So deep

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This feels like some kind of measuring error