Problems with Median absolute deviation (MAD)

Using the function ggerrorplot to make plots with the median and MAD as error bars.

No issues with executing the function but the error bars for one of the groups (x axis) is showing less than 0.

A simple question, can MAD be negative or is there an error in my code?

following code used:
ggerrorplot(Offset_AVM, x = "H_offset", y = "AVM", desc_stat = "median_mad")
plot shows up as expectedRplot

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