Difference in n() count and geom_col graph likely resulted from group

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Difference in n() count and geom_col graph likely resulted from group_by(), but why and how?

Time：12-18

Sorry in advance for I'm an R newbie. So I was working on Divvy Bike Share data (details see

NB: count(x) is a shortcut for group_by(x) %>% summarize(n = n()).