'Why does this percent change code output look weird?

The code in question is:

Pct_change <- Precipitation_Final %>% dplyr::mutate(Previous = lag(Precipitation),
            Next = lead(Precipitation),
            change = Precipitation - Previous,
            changePercentage = (change/Previous)* 100)

Below I have include an image including the dataset and the data types that are being used. This shows the percent change however, it is in a weird format and I would like to change it to:

Date / precipitation / Annual_precipitation / changePercentage

1981-01-01 / 0.04 / 2.964 / 24.9

The numbers are not accurate however, that is the formatting I am trying to produce.

enter image description here

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'Why does this percent change code output look weird?

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